diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/CrackDiagramLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/CrackDiagramLogic.cs
index d16f1db..7018349 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/CrackDiagramLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/CrackDiagramLogic.cs
@@ -26,9 +26,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
         static readonly CrackForceBynarySearchCalculator calculator = new();
         private ITriangulatePrimitiveLogic triangulateLogic;
 
-        private List<IForcesTupleResult> ValidTupleList { get; set; }
+        private List<IExtendedForceTupleCalculatorResult> ValidTupleList { get; set; }
         ArrayParameter<double> arrayParameter;
-        private IEnumerable<IForcesTupleResult> TupleList { get; set; }
+        private IEnumerable<IExtendedForceTupleCalculatorResult> TupleList { get; set; }
         private IEnumerable<INdmPrimitive> NdmPrimitives { get; set; }
 
         private static GeometryNames GeometryNames => ProgramSetting.GeometryNames;
@@ -40,7 +40,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
 
         public IShiftTraceLogger? TraceLogger { get; set; }
 
-        public CrackDiagramLogic(IEnumerable<IForcesTupleResult> tupleList, IEnumerable<INdmPrimitive> ndmPrimitives)
+        public CrackDiagramLogic(IEnumerable<IExtendedForceTupleCalculatorResult> tupleList, IEnumerable<INdmPrimitive> ndmPrimitives)
         {
             TupleList = tupleList;
             NdmPrimitives = ndmPrimitives;
@@ -92,20 +92,20 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
             "Errors appeared during showing a graph, see detailed information");
         }
 
-        private void CalculateWithCrack(List<IForcesTupleResult> validTupleList, IEnumerable<INdmPrimitive> ndmPrimitives, IUnit unitForce, IUnit unitMoment, IUnit unitCurvature)
+        private void CalculateWithCrack(List<IExtendedForceTupleCalculatorResult> validTupleList, IEnumerable<INdmPrimitive> ndmPrimitives, IUnit unitForce, IUnit unitMoment, IUnit unitCurvature)
         {
             var data = arrayParameter.Data;
             for (int i = 0; i < validTupleList.Count(); i++)
             {
                 var valueList = new List<double>
                 {
-                    validTupleList[i].DesignForceTuple.ForceTuple.Mx * unitMoment.Multiplyer,
-                    validTupleList[i].DesignForceTuple.ForceTuple.My * unitMoment.Multiplyer,
-                    validTupleList[i].DesignForceTuple.ForceTuple.Nz * unitForce.Multiplyer
+                    validTupleList[i].ForcesTupleResult.ForceTuple.Mx * unitMoment.Multiplyer,
+                    validTupleList[i].ForcesTupleResult.ForceTuple.My * unitMoment.Multiplyer,
+                    validTupleList[i].ForcesTupleResult.ForceTuple.Nz * unitForce.Multiplyer
                 };
-                calculator.InputData.EndTuple = validTupleList[i].DesignForceTuple.ForceTuple;
-                var limitState = validTupleList[i].DesignForceTuple.LimitState;
-                var calcTerm = validTupleList[i].DesignForceTuple.CalcTerm;
+                calculator.InputData.EndTuple = validTupleList[i].ForcesTupleResult.ForceTuple;
+                var limitState = validTupleList[i].StateCalcTermPair.LimitState;
+                var calcTerm = validTupleList[i].StateCalcTermPair.CalcTerm;
                 triangulateLogic = new TriangulatePrimitiveLogic()
                 {
                     Primitives = ndmPrimitives,
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceCalculatorViewModel.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceCalculatorViewModel.cs
index f1b8476..4d9939a 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceCalculatorViewModel.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceCalculatorViewModel.cs
@@ -1,10 +1,6 @@
-using StructureHelper.Infrastructure.UI.DataContexts;
-using StructureHelper.Windows.ViewModels.NdmCrossSections;
-using StructureHelperCommon.Infrastructures.Enums;
-using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Forces;
 using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
 using StructureHelperLogics.NdmCalculations.Primitives;
-using System;
 using System.Collections.Generic;
 
 
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/DiagramFactory.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/DiagramFactory.cs
index 2b74dd7..94179fc 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/DiagramFactory.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/DiagramFactory.cs
@@ -21,14 +21,14 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
         /// <summary>
         /// Collection of force results
         /// </summary>
-        public List<IForcesTupleResult> TupleList { get; set; }
+        public List<IExtendedForceTupleCalculatorResult> TupleResultList { get; set; }
 
         //public Action<int> SetProgress { get; set; }
 
         public ArrayParameter<double> GetCommonArray()
         {
             var labels = LabelsFactory.GetCommonLabels();
-            arrayParameter = new ArrayParameter<double>(TupleList.Count(), labels);
+            arrayParameter = new ArrayParameter<double>(TupleResultList.Count(), labels);
             Calculate();
             return arrayParameter;
         }
@@ -36,7 +36,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
         private void Calculate()
         {
             var data = arrayParameter.Data;
-            for (int i = 0; i < TupleList.Count(); i++)
+            for (int i = 0; i < TupleResultList.Count(); i++)
             {
                 var valueList = ProcessResult(i);
                 for (int j = 0; j < valueList.Count; j++)
@@ -56,12 +56,12 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
 
             return new List<double>
                 {
-                    TupleList[i].DesignForceTuple.ForceTuple.Mx * unitMoment.Multiplyer,
-                    TupleList[i].DesignForceTuple.ForceTuple.My * unitMoment.Multiplyer,
-                    TupleList[i].DesignForceTuple.ForceTuple.Nz * unitForce.Multiplyer,
-                    TupleList[i].LoaderResults.ForceStrainPair.StrainMatrix.Kx * unitCurvature.Multiplyer,
-                    TupleList[i].LoaderResults.ForceStrainPair.StrainMatrix.Ky * unitCurvature.Multiplyer,
-                    TupleList[i].LoaderResults.ForceStrainPair.StrainMatrix.EpsZ
+                    TupleResultList[i].ForcesTupleResult.ForceTuple.Mx * unitMoment.Multiplyer,
+                    TupleResultList[i].ForcesTupleResult.ForceTuple.My * unitMoment.Multiplyer,
+                    TupleResultList[i].ForcesTupleResult.ForceTuple.Nz * unitForce.Multiplyer,
+                    TupleResultList[i].ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix.Kx * unitCurvature.Multiplyer,
+                    TupleResultList[i].ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix.Ky * unitCurvature.Multiplyer,
+                    TupleResultList[i].ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix.EpsZ
                 };
         }
     }
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/IValuePointDiagramLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/IValuePointDiagramLogic.cs
index a4919bf..ab7ff7e 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/IValuePointDiagramLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/IValuePointDiagramLogic.cs
@@ -8,9 +8,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
 {
     public interface IValuePointDiagramLogic
     {
-        ForceCalculator Calculator { get; set; }
+        IForceCalculator Calculator { get; set; }
         PointPrimitiveLogic PrimitiveLogic { get; set; }
-        IEnumerable<IForcesTupleResult> TupleList { get; set; }
+        IEnumerable<IExtendedForceTupleCalculatorResult> TupleList { get; set; }
         ValueDelegatesLogic ValueDelegatesLogic { get; set; }
 
         GenericResult<ArrayParameter<double>> GetArrayParameter();
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/InterpolateValuePointsLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/InterpolateValuePointsLogic.cs
index 09ac179..02f45b0 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/InterpolateValuePointsLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/InterpolateValuePointsLogic.cs
@@ -1,17 +1,14 @@
-using StructureHelper.Windows.Forces;
+using StructureHelper.Infrastructure.UI.DataContexts;
+using StructureHelper.Windows.Forces;
 using StructureHelperCommon.Infrastructures.Exceptions;
-using StructureHelperCommon.Models.Forces;
-using StructureHelperLogics.NdmCalculations.Analyses.ByForces.Logics;
-using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
-using StructureHelperLogics.NdmCalculations.Primitives;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using StructureHelper.Infrastructure.UI.DataContexts;
 using StructureHelperCommon.Infrastructures.Interfaces;
 using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
+using StructureHelperLogics.NdmCalculations.Analyses.ByForces.Logics;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalculatorViews.ForceResultLogic
 {
@@ -21,9 +18,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         private ValuePointsInterpolateViewModel viewModel;
         private IResult result;
         private ValuePointsInterpolationInputData inputData;
-        public IForcesTupleResult SelectedResult { get; set; }
+        public IExtendedForceTupleCalculatorResult SelectedResult { get; set; }
         public IEnumerable<INdmPrimitive> NdmPrimitives { get; set; }
-        public ForceCalculator ForceCalculator { get; set; }
+        public IForceCalculator ForceCalculator { get; set; }
 
 
         public ILongProcessLogic ProgressLogic { get; set; }
@@ -31,20 +28,20 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
 
         public void InterpolateValuePoints()
         {
-            var tuple = SelectedResult.DesignForceTuple ?? throw new StructureHelperException(ErrorStrings.NullReference + ": Design force combination");
+            var tuple = SelectedResult.ForcesTupleResult.ForceTuple ?? throw new StructureHelperException(ErrorStrings.NullReference + ": Design force combination");
             PrepareInputData(tuple);
             viewModel = new ValuePointsInterpolateViewModel(inputData);
             if (ShowDialog() == false) { return; };
             ShowDiagram(result);
         }
 
-        private void PrepareInputData(IDesignForceTuple tuple)
+        private void PrepareInputData(IForceTuple endTuple)
         {
             inputData = new ValuePointsInterpolationInputData()
             {
-                FinishDesignForce = tuple.Clone() as IDesignForceTuple,
-                LimitState = tuple.LimitState,
-                CalcTerm = tuple.CalcTerm,
+                StartForceTuple = new ForceTuple(),
+                FinishForceTuple = endTuple.Clone() as IForceTuple,
+                StateCalcTermPair = SelectedResult.StateCalcTermPair,
             };
             inputData.PrimitiveBases.AddRange(PrimitiveOperations.ConvertNdmPrimitivesToPrimitiveBase(NdmPrimitives));
         }
@@ -54,7 +51,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
             var wnd = new ValuePointsInterpolateView(viewModel);
             wnd.ShowDialog();
             if (wnd.DialogResult != true) { return false; }
-            interpolationLogic = new InterpolationProgressLogic(ForceCalculator, viewModel.ForceInterpolationViewModel.Result);
+            interpolationLogic = new InterpolationProgressLogic(ForceCalculator, SelectedResult.StateCalcTermPair, viewModel.ForceInterpolationViewModel.Result);
             ProgressLogic = interpolationLogic;
             ShowProgressLogic = new(interpolationLogic)
             {
@@ -68,17 +65,17 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         private void ShowDiagram(IResult result)
         {
             if (result.IsValid == false) { return; }
-            if (result is not IForcesResults)
+            if (result is not IForceCalculatorResult)
             {
-                throw new StructureHelperException(ErrorStrings.ExpectedWas(typeof(IForcesResults), result));
+                throw new StructureHelperException(ErrorStrings.ExpectedWas(typeof(IForceCalculatorResult), result));
             }
-            var tupleResult = result as IForcesResults;
+            var tupleResult = result as IForceCalculatorResult;
             var pointGraphLogic = new ShowValuePointDiagramLogic()
             {
                 Calculator = interpolationLogic.InterpolateCalculator,
                 PrimitiveLogic = viewModel.PrimitiveLogic,
                 ValueDelegatesLogic = viewModel.ValueDelegatesLogic,
-                TupleList = tupleResult.ForcesResultList
+                TupleResultList = tupleResult.ForcesResultList
             };
             pointGraphLogic.ShowWindow();
         }
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowCrackResultLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowCrackResultLogic.cs
index b1ef3ef..f55efbc 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowCrackResultLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowCrackResultLogic.cs
@@ -25,15 +25,15 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         public CalcTerms CalcTerm { get; set; }
         public IForceTuple ForceTuple { get; set; }
         public IEnumerable<INdmPrimitive> ndmPrimitives { get; set; }
-        public void Show(IDesignForceTuple finishDesignTuple)
+        public void Show(IForceTuple finishDesignTuple)
         {
-            var viewModel = new InterpolateTuplesViewModel(finishDesignTuple, null);
+            var viewModel = new InterpolateTuplesViewModel(new ForceTuple(), finishDesignTuple, 100);
             viewModel.ForceInterpolationViewModel.StepCountVisible = false;
             var wndTuples = new InterpolateTuplesView(viewModel);
             wndTuples.ShowDialog();
             if (wndTuples.DialogResult != true) return;
-            var startDesignTuple = viewModel.ForceInterpolationViewModel.StartDesignForce.ForceTuple;
-            var endDesignTuple = viewModel.ForceInterpolationViewModel.FinishDesignForce.ForceTuple;
+            var startDesignTuple = viewModel.ForceInterpolationViewModel.StartDesignForce;
+            var endDesignTuple = viewModel.ForceInterpolationViewModel.FinishDesignForce;
             FindCrackFactor(endDesignTuple, startDesignTuple);
         }
 
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowDiagramLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowDiagramLogic.cs
index 033e827..b61acc5 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowDiagramLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowDiagramLogic.cs
@@ -1,12 +1,9 @@
 using StructureHelper.Windows.Graphs;
 using StructureHelper.Windows.ViewModels.Errors;
-using StructureHelperCommon.Infrastructures.Enums;
 using StructureHelperCommon.Infrastructures.Exceptions;
 using StructureHelperCommon.Infrastructures.Interfaces;
-using StructureHelperCommon.Infrastructures.Settings;
 using StructureHelperCommon.Models;
 using StructureHelperCommon.Models.Parameters;
-using StructureHelperCommon.Services.Units;
 using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
 using StructureHelperLogics.NdmCalculations.Primitives;
 using System;
@@ -19,9 +16,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
     internal class ShowDiagramLogic : ILongProcessLogic
     {
         private ArrayParameter<double> arrayParameter;
-        private IEnumerable<IForcesTupleResult> tupleList;
+        private IEnumerable<IExtendedForceTupleCalculatorResult> tupleList;
         private IEnumerable<INdmPrimitive> ndmPrimitives;
-        private List<IForcesTupleResult> validTupleList;
+        private List<IExtendedForceTupleCalculatorResult> validTupleList;
 
         public int StepCount => validTupleList.Count();
 
@@ -60,13 +57,13 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
 
             var factory = new DiagramFactory()
             {
-                TupleList = validTupleList,
+                TupleResultList = validTupleList,
                 //SetProgress = SetProgress,
             };
             arrayParameter = factory.GetCommonArray();
         }
 
-        public ShowDiagramLogic(IEnumerable<IForcesTupleResult> tupleList, IEnumerable<INdmPrimitive> ndmPrimitives)
+        public ShowDiagramLogic(IEnumerable<IExtendedForceTupleCalculatorResult> tupleList, IEnumerable<INdmPrimitive> ndmPrimitives)
         {
             this.tupleList = tupleList;
             this.ndmPrimitives = ndmPrimitives;
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowValuePointDiagramLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowValuePointDiagramLogic.cs
index abcc47d..0df8a06 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowValuePointDiagramLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ShowValuePointDiagramLogic.cs
@@ -1,27 +1,12 @@
-using LoaderCalculator.Data.Materials.MaterialBuilders;
-using LoaderCalculator.Data.Ndms;
-using StructureHelper.Infrastructure.UI.DataContexts;
-using StructureHelper.Services.ResultViewers;
-using StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalculatorViews.ForceResultLogic;
+using StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalculatorViews.ForceResultLogic;
 using StructureHelper.Windows.Forces;
 using StructureHelper.Windows.Graphs;
 using StructureHelper.Windows.ViewModels.Errors;
-using StructureHelperCommon.Infrastructures.Enums;
 using StructureHelperCommon.Infrastructures.Exceptions;
-using StructureHelperCommon.Infrastructures.Interfaces;
-using StructureHelperCommon.Models;
 using StructureHelperCommon.Models.Calculators;
-using StructureHelperCommon.Models.Forces;
 using StructureHelperCommon.Models.Parameters;
-using StructureHelperCommon.Models.Shapes;
 using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
-using StructureHelperLogics.NdmCalculations.Primitives;
-using System;
 using System.Collections.Generic;
-using System.ComponentModel;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 //Copyright (c) 2023 Redikultsev Evgeny, Ekaterinburg, Russia
 //All rights reserved.
@@ -33,8 +18,8 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
         private ArrayParameter<double> arrayParameter;
         private IValuePointDiagramLogic pointDiagramLogic;
 
-        public IEnumerable<IForcesTupleResult> TupleList { get; set; }
-        public ForceCalculator Calculator { get; set; }
+        public IEnumerable<IExtendedForceTupleCalculatorResult> TupleResultList { get; set; }
+        public IForceCalculator Calculator { get; set; }
         public PointPrimitiveLogic PrimitiveLogic { get; set; }
         public ValueDelegatesLogic ValueDelegatesLogic { get; set; }
 
@@ -77,7 +62,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews
 
         private GenericResult<ArrayParameter<double>> GetResult()
         {
-            pointDiagramLogic.TupleList = TupleList;
+            pointDiagramLogic.TupleList = TupleResultList;
             pointDiagramLogic.PrimitiveLogic = PrimitiveLogic;
             pointDiagramLogic.Calculator = Calculator;
             pointDiagramLogic.ValueDelegatesLogic = ValueDelegatesLogic;
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ValuePointDiagramLogic.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ValuePointDiagramLogic.cs
index 6ab9ef0..a9355e1 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ValuePointDiagramLogic.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForceResultLogic/ValuePointDiagramLogic.cs
@@ -1,5 +1,4 @@
 using LoaderCalculator.Data.Ndms;
-using StructureHelper.Infrastructure.UI.DataContexts;
 using StructureHelper.Services.ResultViewers;
 using StructureHelper.Windows.Forces;
 using StructureHelperCommon.Infrastructures.Exceptions;
@@ -10,9 +9,6 @@ using StructureHelperLogics.NdmCalculations.Primitives;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows.Media;
 
 namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalculatorViews.ForceResultLogic
 {
@@ -20,13 +16,13 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
     {
         private ArrayParameter<double> arrayParameter;
         private List<(INamedAreaPoint areaPoint, INdmPrimitive ndmPrimitive)> pointCollection;
-        private List<IForcesTupleResult> validTuplesList;
+        private List<IExtendedForceTupleCalculatorResult> validTuplesList;
         private ArrayParameter<double> arrayOfValuesByPoint;
         private IEnumerable<ForceResultFunc> selectedDelegates;
         private string exceptionMessage;
 
-        public IEnumerable<IForcesTupleResult> TupleList { get; set; }
-        public ForceCalculator Calculator { get; set; }
+        public IEnumerable<IExtendedForceTupleCalculatorResult> TupleList { get; set; }
+        public IForceCalculator Calculator { get; set; }
         public PointPrimitiveLogic PrimitiveLogic { get; set; }
         public ValueDelegatesLogic ValueDelegatesLogic { get; set; }
 
@@ -106,14 +102,14 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
                 }
             }
         }
-        private void ProcessPointByTuple(IForcesTupleResult tuple, int i)
+        private void ProcessPointByTuple(IExtendedForceTupleCalculatorResult tupleResult, int i)
         {
             var values = new List<double>();
-            var strainMatrix = tuple.LoaderResults.ForceStrainPair.StrainMatrix;
+            var strainMatrix = tupleResult.ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix;
 
             foreach (var valuePoint in pointCollection)
             {
-                var ndm = GetMockNdm(valuePoint, tuple);
+                var ndm = GetMockNdm(valuePoint, tupleResult);
 
                 foreach (var valDelegate in selectedDelegates)
                 {
@@ -127,7 +123,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         {
             var factory = new DiagramFactory()
             {
-                TupleList = validTuplesList,
+                TupleResultList = validTuplesList,
                 //SetProgress = SetProgress,
             };
             arrayParameter = factory.GetCommonArray();
@@ -135,10 +131,10 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
             var labels = GetValueLabels(selectedDelegates);
             arrayOfValuesByPoint = new ArrayParameter<double>(validTuplesList.Count(), labels);
         }
-        private INdm GetMockNdm((INamedAreaPoint areaPoint, INdmPrimitive ndmPrimitive) valuePoint, IForcesTupleResult tuple)
+        private INdm GetMockNdm((INamedAreaPoint areaPoint, INdmPrimitive ndmPrimitive) valuePoint, IExtendedForceTupleCalculatorResult tupleResult)
         {
-            var limitState = tuple.DesignForceTuple.LimitState;
-            var calcTerm = tuple.DesignForceTuple.CalcTerm;
+            var limitState = tupleResult.StateCalcTermPair.LimitState;
+            var calcTerm = tupleResult.StateCalcTermPair.CalcTerm;
             var material = valuePoint.ndmPrimitive.NdmElement.HeadMaterial.GetLoaderMaterial(limitState, calcTerm);
             var userPrestrain = valuePoint.ndmPrimitive.NdmElement.UsersPrestrain;
             var autoPrestrain = valuePoint.ndmPrimitive.NdmElement.AutoPrestrain;
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsView.xaml b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsView.xaml
index 722b3f1..baead56 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsView.xaml
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsView.xaml
@@ -37,7 +37,7 @@
             <ToolBar Name="CrackResult">
                 <Button Style="{DynamicResource ToolButton}" Command="{Binding ShowCrackResultCommand}">
                     <Button.ToolTip>
-                        <uc:ButtonToolTipEh HeaderText="Show result step by step"
+                        <uc:ButtonToolTipEh HeaderText="Show crack result step by step"
                                                 IconContent="{StaticResource CrackForces}"
                                                 DescriptionText="Show proportional combination of forces where cracks are appeared"/>
                     </Button.ToolTip>
@@ -164,17 +164,17 @@
                 </DataGrid.RowStyle>
                 <DataGrid.Columns>
                     <DataGridCheckBoxColumn Header="Valid" Binding="{Binding Path=IsValid}"/>
-                    <DataGridTextColumn Header="LimitState" Width="70" Binding="{Binding DesignForceTuple.LimitState}"/>
-                    <DataGridTextColumn Header="Duration" Width="70" Binding="{Binding DesignForceTuple.CalcTerm}"/>
-                    <DataGridTextColumn Header="Moment Mx" Width="90" Binding="{Binding DesignForceTuple.ForceTuple.Mx, Converter={StaticResource MomentConverter}}"/>
-                    <DataGridTextColumn Header="Moment My" Width="90" Binding="{Binding DesignForceTuple.ForceTuple.My, Converter={StaticResource MomentConverter}}"/>
-                    <DataGridTextColumn Header="Force Nz" Width="90" Binding="{Binding DesignForceTuple.ForceTuple.Nz, Converter={StaticResource ForceConverter}}"/>
-                    <DataGridTextColumn Header="Kx" Width="90" Binding="{Binding LoaderResults.ForceStrainPair.StrainMatrix.Kx}"/>
-                    <DataGridTextColumn Header="Ky" Width="90" Binding="{Binding LoaderResults.ForceStrainPair.StrainMatrix.Ky}"/>
-                    <DataGridTextColumn Header="EpsZ" Width="90" Binding="{Binding LoaderResults.ForceStrainPair.StrainMatrix.EpsZ}"/>
-                    <DataGridTextColumn Header="Accuracy" Width="90" Binding="{Binding LoaderResults.AccuracyRate}"/>
-                    <DataGridTextColumn Header="Max Iteration" Width="90" Binding="{Binding LoaderResults.IterationCounter}"/>
-                    <DataGridTextColumn Header="Description" Width="300" Binding="{Binding Description}"/>
+                    <DataGridTextColumn Header="LimitState" Width="70" Binding="{Binding  StateCalcTermPair.LimitState}"/>
+                    <DataGridTextColumn Header="Duration" Width="70" Binding="{Binding StateCalcTermPair.CalcTerm}"/>
+                    <DataGridTextColumn Header="Moment Mx" Width="90" Binding="{Binding ForcesTupleResult.InputData.ForceTuple.Mx, Converter={StaticResource MomentConverter}}"/>
+                    <DataGridTextColumn Header="Moment My" Width="90" Binding="{Binding ForcesTupleResult.InputData.ForceTuple.My, Converter={StaticResource MomentConverter}}"/>
+                    <DataGridTextColumn Header="Force Nz" Width="90" Binding="{Binding ForcesTupleResult.InputData.ForceTuple.Nz, Converter={StaticResource ForceConverter}}"/>
+                    <DataGridTextColumn Header="Kx" Width="90" Binding="{Binding ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix.Kx}"/>
+                    <DataGridTextColumn Header="Ky" Width="90" Binding="{Binding ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix.Ky}"/>
+                    <DataGridTextColumn Header="EpsZ" Width="90" Binding="{Binding ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix.EpsZ}"/>
+                    <DataGridTextColumn Header="Accuracy" Width="90" Binding="{Binding ForcesTupleResult.LoaderResults.AccuracyRate}"/>
+                    <DataGridTextColumn Header="Max Iteration" Width="90" Binding="{Binding ForcesTupleResult.LoaderResults.IterationCounter}"/>
+                    <DataGridTextColumn Header="Description" Width="300" Binding="{Binding ForcesTupleResult.Description}"/>
                 </DataGrid.Columns>
             </DataGrid>
             <ContentControl Grid.Row="1" ContentTemplate="{StaticResource ResultValidness}" Content="{Binding ValidResultCounter}"/>
diff --git a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsViewModel.cs b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsViewModel.cs
index ce0b26f..68d14da 100644
--- a/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsViewModel.cs
+++ b/StructureHelper/Windows/CalculationWindows/CalculatorsViews/ForceCalculatorViews/ForcesResultsViewModel.cs
@@ -18,7 +18,6 @@ using StructureHelperCommon.Infrastructures.Interfaces;
 using StructureHelperCommon.Infrastructures.Settings;
 using StructureHelperCommon.Models.Forces;
 using StructureHelperCommon.Models.Shapes;
-using StructureHelperCommon.Services.Exports;
 using StructureHelperCommon.Services.Exports.Factories;
 using StructureHelperCommon.Services.Forces;
 using StructureHelperLogics.NdmCalculations.Analyses;
@@ -42,13 +41,13 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
     public class ForcesResultsViewModel : ViewModelBase
     {
         private ShowDiagramLogic showDiagramLogic;
-        private ForceCalculator forceCalculator;
+        private IForceCalculator forceCalculator;
         private ILongProcessLogic progressLogic;
         private ShowProgressLogic showProgressLogic;
         private InteractionDiagramLogic interactionDiagramLogic;
         private static readonly ShowCrackResultLogic showCrackResultLogic = new();
         //private static readonly ShowCrackWidthLogic showCrackWidthLogic = new();
-        private IForcesResults resultModel;
+        private IForceCalculatorResult resultModel;
         private IEnumerable<INdmPrimitive> ndmPrimitives;
         private IEnumerable<INdmPrimitive> selectedNdmPrimitives;
         private IEnumerable<INdm> ndms;
@@ -56,7 +55,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
 
         public static GeometryNames GeometryNames => ProgramSetting.GeometryNames;
 
-        public IForcesTupleResult? SelectedResult { get; set; }
+        public IExtendedForceTupleCalculatorResult? SelectedResult { get; set; }
         private ICommand? showIsoFieldCommand;
         private ICommand? exportToCSVCommand;
         private ICommand? interpolateCommand;
@@ -73,7 +72,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
 
         public ValidResultCounterVM ValidResultCounter { get; }
 
-        public IForcesResults ForcesResults
+        public IForceCalculatorResult ForcesResults
         {
             get => resultModel;
         }
@@ -149,7 +148,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
                 ShowInterpolationWindow(out interpolateTuplesViewModel, out wndTuples);
                 if (wndTuples.DialogResult != true) return;
 
-                var interpolationLogic = new InterpolationProgressLogic(forceCalculator, interpolateTuplesViewModel.ForceInterpolationViewModel.Result);
+                var interpolationLogic = new InterpolationProgressLogic(forceCalculator, SelectedResult.StateCalcTermPair, interpolateTuplesViewModel.ForceInterpolationViewModel.Result);
                 showProgressLogic = new(interpolationLogic)
                 {
                     WindowTitle = "Interpolate forces"
@@ -157,9 +156,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
                 showProgressLogic.Show();
 
                 var result = interpolationLogic.InterpolateCalculator.Result;
-                if (result is IForcesResults)
+                if (result is IForceCalculatorResult)
                 {
-                    var tupleResult = result as IForcesResults;
+                    var tupleResult = result as IForceCalculatorResult;
                     var diagramLogic = new ShowDiagramLogic(tupleResult.ForcesResultList, ndmPrimitives);
                     showProgressLogic = new(diagramLogic)
                     {
@@ -179,7 +178,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
                 ShowInterpolationWindow(out interploateTuplesViewModel, out wndTuples);
                 if (wndTuples.DialogResult != true) return;
 
-                var interpolationLogic = new InterpolationProgressLogic(forceCalculator, interploateTuplesViewModel.ForceInterpolationViewModel.Result);
+                var interpolationLogic = new InterpolationProgressLogic(forceCalculator, SelectedResult.StateCalcTermPair, interploateTuplesViewModel.ForceInterpolationViewModel.Result);
                 showProgressLogic = new(interpolationLogic)
                 {
                     WindowTitle = "Interpolate forces"
@@ -187,9 +186,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
                 showProgressLogic.Show();
 
                 var result = interpolationLogic.InterpolateCalculator.Result;
-                if (result is IForcesResults)
+                if (result is IForceCalculatorResult)
                 {
-                    var tupleResult = result as IForcesResults;
+                    var tupleResult = result as IForceCalculatorResult;
                     var diagramLogic = new CrackDiagramLogic(tupleResult.ForcesResultList, ndmPrimitives);
                     showProgressLogic = new(diagramLogic)
                     {
@@ -209,11 +208,11 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         }
         private void ShowCrackResult()
         {
-            showCrackResultLogic.LimitState = SelectedResult.DesignForceTuple.LimitState;
-            showCrackResultLogic.CalcTerm = CalcTerms.ShortTerm; //= SelectedResult.DesignForceTuple.CalcTerm;
-            showCrackResultLogic.ForceTuple = SelectedResult.DesignForceTuple.ForceTuple;
+            showCrackResultLogic.LimitState = SelectedResult.StateCalcTermPair.LimitState;
+            showCrackResultLogic.CalcTerm = CalcTerms.ShortTerm;
+            showCrackResultLogic.ForceTuple = SelectedResult.ForcesTupleResult.InputData.ForceTuple;
             showCrackResultLogic.ndmPrimitives = ndmPrimitives;
-            showCrackResultLogic.Show(SelectedResult.DesignForceTuple.Clone() as IDesignForceTuple);
+            showCrackResultLogic.Show(SelectedResult.ForcesTupleResult.InputData.ForceTuple.Clone() as IForceTuple);
         }
 
         public ICommand InterpolateCommand
@@ -235,7 +234,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
             ShowInterpolationWindow(out interploateTuplesViewModel, out wndTuples);
             if (wndTuples.DialogResult != true) return;
 
-            var interpolationLogic = new InterpolationProgressLogic(forceCalculator, interploateTuplesViewModel.ForceInterpolationViewModel.Result);
+            var interpolationLogic = new InterpolationProgressLogic(forceCalculator, SelectedResult.StateCalcTermPair, interploateTuplesViewModel.ForceInterpolationViewModel.Result);
             progressLogic = interpolationLogic;
             showProgressLogic = new(interpolationLogic)
             {
@@ -276,8 +275,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
 
         private void ShowInterpolationWindow(out InterpolateTuplesViewModel interploateTuplesViewModel, out InterpolateTuplesView wndTuples)
         {
-            IDesignForceTuple finishDesignTuple = SelectedResult.DesignForceTuple.Clone() as IDesignForceTuple;
-            interploateTuplesViewModel = new InterpolateTuplesViewModel(finishDesignTuple, null);
+            ForceTuple startTuple = new();
+            IForceTuple endTuple = SelectedResult.ForcesTupleResult.InputData.ForceTuple.Clone() as IForceTuple;
+            interploateTuplesViewModel = new InterpolateTuplesViewModel(startTuple, endTuple, 100);
             wndTuples = new InterpolateTuplesView(interploateTuplesViewModel);
             wndTuples.ShowDialog();
         }
@@ -308,7 +308,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         }
         private void SetPrestrain()
         {
-            var source = TupleConverter.ConvertToStrainTuple(SelectedResult.LoaderResults.StrainMatrix);
+            var source = TupleConverter.ConvertToStrainTuple(SelectedResult.ForcesTupleResult.LoaderResults.StrainMatrix);
             var vm = new SetPrestrainViewModel(source);
             var wnd = new SetPrestrainView(vm);
             wnd.ShowDialog();
@@ -336,9 +336,9 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         {
             try
             {
-                var strainMatrix = SelectedResult.LoaderResults.ForceStrainPair.StrainMatrix;
-                var limitState = SelectedResult.DesignForceTuple.LimitState;
-                var calcTerm = SelectedResult.DesignForceTuple.CalcTerm;
+                var strainMatrix = SelectedResult.ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix;
+                var limitState = SelectedResult.StateCalcTermPair.LimitState;
+                var calcTerm = SelectedResult.StateCalcTermPair.CalcTerm;
 
                 var primitiveSets = ShowAnchorageResult.GetPrimitiveSets(strainMatrix, limitState, calcTerm, ndmPrimitives);
                 isoFieldReport = new IsoFieldReport(primitiveSets);
@@ -363,7 +363,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
             {
                 try
                 {
-                    var strainMatrix = SelectedResult.LoaderResults.ForceStrainPair.StrainMatrix;
+                    var strainMatrix = SelectedResult.ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix;
                     var textParametrsLogic = new GeometryParametersLogic(ndms, strainMatrix);
                     var calculator = new GeometryCalculator(textParametrsLogic);
                     calculator.Run();
@@ -392,7 +392,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
             {
                 try
                 {
-                    var strainMatrix = SelectedResult.LoaderResults.ForceStrainPair.StrainMatrix;
+                    var strainMatrix = SelectedResult.ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix;
                     var textParametrsLogic = new ForcesParametersLogic(ndms, strainMatrix);
                     var calculator = new GeometryCalculator(textParametrsLogic);
                     calculator.Run();
@@ -412,10 +412,10 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
             }
         }
 
-        public ForcesResultsViewModel(ForceCalculator forceCalculator)
+        public ForcesResultsViewModel(IForceCalculator forceCalculator)
         {
             this.forceCalculator = forceCalculator;
-            resultModel = forceCalculator.Result as IForcesResults;
+            resultModel = forceCalculator.Result as IForceCalculatorResult;
             ValidResultCounter = new(resultModel.ForcesResultList);
             ndmPrimitives = forceCalculator.InputData.Primitives;
         }
@@ -424,7 +424,7 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         {
             try
             {
-                IStrainMatrix strainMatrix = SelectedResult.LoaderResults.ForceStrainPair.StrainMatrix;
+                IStrainMatrix strainMatrix = SelectedResult.ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix;
                 var primitiveSets = ShowIsoFieldResult.GetPrimitiveSets(strainMatrix, ndms, ForceResultFuncFactory.GetResultFuncs());
                 isoFieldReport = new IsoFieldReport(primitiveSets);
                 isoFieldReport.Show();
@@ -441,9 +441,12 @@ namespace StructureHelper.Windows.CalculationWindows.CalculatorsViews.ForceCalcu
         }
         private void GetNdms()
         {
-            var limitState = SelectedResult.DesignForceTuple.LimitState;
-            var calcTerm = SelectedResult.DesignForceTuple.CalcTerm;
-            var triangulationOptions = new TriangulationOptions() { LimiteState = limitState, CalcTerm = calcTerm };
+            var limitState = SelectedResult.StateCalcTermPair.LimitState;
+            var calcTerm = SelectedResult.StateCalcTermPair.CalcTerm;
+            var triangulationOptions = new TriangulationOptions()
+            {
+                LimiteState = limitState,
+                CalcTerm = calcTerm };
             var orderedNdmPrimitives = ndmPrimitives.OrderBy(x => x.VisualProperty.ZIndex);
             var ndmRange = new List<INdm>();
             foreach (var item in orderedNdmPrimitives)
diff --git a/StructureHelper/Windows/Forces/ForceInterpolationControl.xaml.cs b/StructureHelper/Windows/Forces/ForceInterpolationControl.xaml.cs
index 05f924a..5ab26c3 100644
--- a/StructureHelper/Windows/Forces/ForceInterpolationControl.xaml.cs
+++ b/StructureHelper/Windows/Forces/ForceInterpolationControl.xaml.cs
@@ -41,16 +41,16 @@ namespace StructureHelper.Windows.Forces
         private void StartValueChanged(object sender, EventArgs e)
         {
             var obj = (MultiplyDouble)sender;
-            var tmpTuple = ForceTupleService.MultiplyTupleByFactor(Properties.StartDesignForce.ForceTuple, obj.DoubleFactor);
-            ForceTupleService.CopyProperties(tmpTuple, Properties.StartDesignForce.ForceTuple, 1d);
+            var tmpTuple = ForceTupleService.MultiplyTupleByFactor(Properties.StartDesignForce, obj.DoubleFactor);
+            ForceTupleService.CopyProperties(tmpTuple, Properties.StartDesignForce, 1d);
             Properties.RefreshStartTuple();
         }
 
         private void FinishValueChanged(object sender, EventArgs e)
         {
             var obj = (MultiplyDouble)sender;
-            var tmpTuple = ForceTupleService.MultiplyTupleByFactor(Properties.FinishDesignForce.ForceTuple, obj.DoubleFactor);
-            ForceTupleService.CopyProperties(tmpTuple, Properties.FinishDesignForce.ForceTuple, 1d);
+            var tmpTuple = ForceTupleService.MultiplyTupleByFactor(Properties.FinishDesignForce, obj.DoubleFactor);
+            ForceTupleService.CopyProperties(tmpTuple, Properties.FinishDesignForce, 1d);
             Properties.RefreshFinishTuple();
         }
 
diff --git a/StructureHelper/Windows/Forces/ForceTupleInterpolationViewModel.cs b/StructureHelper/Windows/Forces/ForceTupleInterpolationViewModel.cs
index 6259e1e..533c6c8 100644
--- a/StructureHelper/Windows/Forces/ForceTupleInterpolationViewModel.cs
+++ b/StructureHelper/Windows/Forces/ForceTupleInterpolationViewModel.cs
@@ -1,11 +1,5 @@
 using StructureHelper.Infrastructure;
-using StructureHelperCommon.Infrastructures.Exceptions;
 using StructureHelperCommon.Models.Forces;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Input;
 
 namespace StructureHelper.Windows.Forces
@@ -16,21 +10,21 @@ namespace StructureHelper.Windows.Forces
         private RelayCommand copyToStartCommand;
         private RelayCommand copyToFinishCommand;
         private int stepCount;
-        private IDesignForceTuple startDesignForce;
-        private IDesignForceTuple finishDesignForce;
+        private IForceTuple startForceTuple;
+        private IForceTuple endForceTuple;
 
-        public IDesignForceTuple StartDesignForce
+        public IForceTuple StartDesignForce
         {
-            get => startDesignForce; set
+            get => startForceTuple; set
             {
-                startDesignForce = value;
+                startForceTuple = value;
             }
         }
-        public IDesignForceTuple FinishDesignForce
+        public IForceTuple FinishDesignForce
         {
-            get => finishDesignForce; set
+            get => endForceTuple; set
             {
-                finishDesignForce = value;
+                endForceTuple = value;
             }
         }
 
@@ -41,55 +35,55 @@ namespace StructureHelper.Windows.Forces
         public bool StepCountVisible { get; set; }
         public double StartMx
         {
-            get => StartDesignForce.ForceTuple.Mx;
+            get => StartDesignForce.Mx;
             set
             {
-                StartDesignForce.ForceTuple.Mx = value;
+                StartDesignForce.Mx = value;
                 OnPropertyChanged(nameof(StartMx));
             }
         }
         public double StartMy
         {
-            get => StartDesignForce.ForceTuple.My;
+            get => StartDesignForce.My;
             set
             {
-                StartDesignForce.ForceTuple.My = value;
+                StartDesignForce.My = value;
                 OnPropertyChanged(nameof(StartMy));
             }
         }
         public double StartNz
         {
-            get => StartDesignForce.ForceTuple.Nz;
+            get => StartDesignForce.Nz;
             set
             {
-                StartDesignForce.ForceTuple.Nz = value;
+                StartDesignForce.Nz = value;
                 OnPropertyChanged(nameof(StartNz));
             }
         }
         public double FinishMx
         {
-            get => FinishDesignForce.ForceTuple.Mx;
+            get => FinishDesignForce.Mx;
             set
             {
-                FinishDesignForce.ForceTuple.Mx = value;
+                FinishDesignForce.Mx = value;
                 OnPropertyChanged(nameof(FinishMx));
             }
         }
         public double FinishMy
         {
-            get => FinishDesignForce.ForceTuple.My;
+            get => FinishDesignForce.My;
             set
             {
-                FinishDesignForce.ForceTuple.My = value;
+                FinishDesignForce.My = value;
                 OnPropertyChanged(nameof(FinishMy));
             }
         }
         public double FinishNz
         {
-            get => FinishDesignForce.ForceTuple.Nz;
+            get => FinishDesignForce.Nz;
             set
             {
-                FinishDesignForce.ForceTuple.Nz = value;
+                FinishDesignForce.Nz = value;
                 OnPropertyChanged(nameof(FinishNz));
             }
         }
@@ -126,7 +120,7 @@ namespace StructureHelper.Windows.Forces
 
         private void InvertForces()
         {
-            var tmpForce = StartDesignForce.Clone() as IDesignForceTuple;
+            var tmpForce = StartDesignForce.Clone() as IForceTuple;
             StartDesignForce = FinishDesignForce;
             FinishDesignForce = tmpForce;
             StepCountVisible = true;
@@ -136,13 +130,13 @@ namespace StructureHelper.Windows.Forces
 
         private void CopyStartToFinish()
         {
-            FinishDesignForce = StartDesignForce.Clone() as IDesignForceTuple;
+            FinishDesignForce = StartDesignForce.Clone() as IForceTuple;
             RefreshFinishTuple();
         }
 
         private void CopyFinishToStart()
         {
-            StartDesignForce = FinishDesignForce.Clone() as IDesignForceTuple;
+            StartDesignForce = FinishDesignForce.Clone() as IForceTuple;
             RefreshStartTuple();
         }
 
@@ -162,18 +156,10 @@ namespace StructureHelper.Windows.Forces
             OnPropertyChanged(nameof(StartNz));
         }
 
-        public ForceTupleInterpolationViewModel(IDesignForceTuple finishDesignForce, IDesignForceTuple startDesignForce = null, int stepCount = 100)
+        public ForceTupleInterpolationViewModel(IForceTuple startForceTuple, IForceTuple endForceTuple, int stepCount = 100)
         {
-            if (startDesignForce != null)
-            {
-                CheckDesignForces(finishDesignForce, startDesignForce);
-                StartDesignForce = startDesignForce;
-            }
-            else
-            {
-                GetNewDesignForce(finishDesignForce);
-            }
-            FinishDesignForce = finishDesignForce;
+            this.startForceTuple = startForceTuple;
+            this.endForceTuple = endForceTuple;
             StepCount = stepCount;
             StepCountVisible = true;
         }
@@ -181,32 +167,5 @@ namespace StructureHelper.Windows.Forces
         {
             
         }
-
-        private static void CheckDesignForces(IDesignForceTuple finishDesignForce, IDesignForceTuple startDesignForce)
-        {
-            if (startDesignForce.LimitState != finishDesignForce.LimitState)
-            {
-                throw new StructureHelperException(ErrorStrings.LimitStatesIsNotValid);
-            }
-            if (startDesignForce.CalcTerm != finishDesignForce.CalcTerm)
-            {
-                throw new StructureHelperException(ErrorStrings.LoadTermIsNotValid);
-            }
-        }
-
-        private void GetNewDesignForce(IDesignForceTuple finishDesignForce)
-        {
-            StartDesignForce = new DesignForceTuple()
-            {
-                CalcTerm = finishDesignForce.CalcTerm,
-                LimitState = finishDesignForce.LimitState,
-                ForceTuple = new ForceTuple()
-                {
-                    Mx = 0,
-                    My = 0,
-                    Nz = 0
-                },
-            };
-        }
     }
 }
diff --git a/StructureHelper/Windows/Forces/InterpolateTuplesViewModel.cs b/StructureHelper/Windows/Forces/InterpolateTuplesViewModel.cs
index 52dab9c..16849d7 100644
--- a/StructureHelper/Windows/Forces/InterpolateTuplesViewModel.cs
+++ b/StructureHelper/Windows/Forces/InterpolateTuplesViewModel.cs
@@ -1,8 +1,5 @@
-using StructureHelper.Infrastructure;
-using StructureHelper.Windows.ViewModels;
-using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelper.Windows.ViewModels;
 using StructureHelperCommon.Models.Forces;
-using System.Windows.Input;
 
 namespace StructureHelper.Windows.Forces
 {
@@ -10,9 +7,9 @@ namespace StructureHelper.Windows.Forces
     {
         public ForceTupleInterpolationViewModel ForceInterpolationViewModel { get; set; }
 
-        public InterpolateTuplesViewModel(IDesignForceTuple finishDesignForce, IDesignForceTuple startDesignForce=null, int stepCount = 100)
+        public InterpolateTuplesViewModel(IForceTuple startTuple, IForceTuple endTuple, int stepCount = 100)
         {
-            ForceInterpolationViewModel = new(finishDesignForce, startDesignForce, stepCount);
+            ForceInterpolationViewModel = new(startTuple, endTuple, stepCount);
         }
     }
 }
diff --git a/StructureHelper/Windows/Forces/ValuePointsInterpolateViewModel.cs b/StructureHelper/Windows/Forces/ValuePointsInterpolateViewModel.cs
index c5039d2..9dab068 100644
--- a/StructureHelper/Windows/Forces/ValuePointsInterpolateViewModel.cs
+++ b/StructureHelper/Windows/Forces/ValuePointsInterpolateViewModel.cs
@@ -19,7 +19,7 @@ namespace StructureHelper.Windows.Forces
         public ValuePointsInterpolateViewModel(ValuePointsInterpolationInputData inputData)
         {
             this.inputData = inputData;
-            ForceInterpolationViewModel = new(this.inputData.FinishDesignForce, this.inputData.StartDesignForce, this.inputData.StepCount);
+            ForceInterpolationViewModel = new(this.inputData.StartForceTuple, this.inputData.FinishForceTuple, this.inputData.StepCount);
             PrimitiveLogic = new PointPrimitiveLogic(inputData.PrimitiveBases);
             ValueDelegatesLogic = new();
         }
diff --git a/StructureHelper/Windows/Forces/ValuePointsInterpolationInputData.cs b/StructureHelper/Windows/Forces/ValuePointsInterpolationInputData.cs
index bcad43a..02ce310 100644
--- a/StructureHelper/Windows/Forces/ValuePointsInterpolationInputData.cs
+++ b/StructureHelper/Windows/Forces/ValuePointsInterpolationInputData.cs
@@ -1,22 +1,17 @@
 using StructureHelper.Infrastructure.UI.DataContexts;
-using StructureHelperCommon.Infrastructures.Enums;
 using StructureHelperCommon.Models.Forces;
-using System;
+using StructureHelperCommon.Models.States;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace StructureHelper.Windows.Forces
 {
     public class ValuePointsInterpolationInputData
     {
-        public IDesignForceTuple FinishDesignForce { get; set; }
-        public IDesignForceTuple StartDesignForce { get; set; }
+        public IForceTuple FinishForceTuple { get; set; }
+        public IForceTuple StartForceTuple { get; set; }
         public int StepCount { get; set; }
         public List<PrimitiveBase> PrimitiveBases { get; private set; }
-        public LimitStates LimitState { get; set; }
-        public CalcTerms CalcTerm { get; set; }
+        public IStateCalcTermPair StateCalcTermPair { get; set; }
 
         public ValuePointsInterpolationInputData()
         {
diff --git a/StructureHelper/Windows/ViewModels/Calculations/CalculationResult/CalculationResultViewModel.cs b/StructureHelper/Windows/ViewModels/Calculations/CalculationResult/CalculationResultViewModel.cs
index 5bafcf7..687b2cf 100644
--- a/StructureHelper/Windows/ViewModels/Calculations/CalculationResult/CalculationResultViewModel.cs
+++ b/StructureHelper/Windows/ViewModels/Calculations/CalculationResult/CalculationResultViewModel.cs
@@ -5,13 +5,8 @@ using StructureHelper.Services.Reports;
 using StructureHelper.Services.Reports.CalculationReports;
 using StructureHelper.Services.ResultViewers;
 using StructureHelperLogics.Models.Calculations.CalculationsResults;
-using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows.Input;
 
 namespace StructureHelper.Windows.ViewModels.Calculations.CalculationResult
 {
diff --git a/StructureHelperCommon/Models/Forces/InterpolateTuplesResult.cs b/StructureHelperCommon/Models/Forces/InterpolateTuplesResult.cs
index d576653..b4ec718 100644
--- a/StructureHelperCommon/Models/Forces/InterpolateTuplesResult.cs
+++ b/StructureHelperCommon/Models/Forces/InterpolateTuplesResult.cs
@@ -2,8 +2,8 @@
 {
     public class InterpolateTuplesResult
     {
-        public IDesignForceTuple StartTuple { get; set; }
-        public IDesignForceTuple FinishTuple { get; set; }
+        public IForceTuple StartTuple { get; set; }
+        public IForceTuple FinishTuple { get; set; }
         public int StepCount { get; set; }
     }
 }
diff --git a/StructureHelperCommon/Services/Forces/ForceTupleService.cs b/StructureHelperCommon/Services/Forces/ForceTupleService.cs
index 905b0e3..3ff7d72 100644
--- a/StructureHelperCommon/Services/Forces/ForceTupleService.cs
+++ b/StructureHelperCommon/Services/Forces/ForceTupleService.cs
@@ -50,14 +50,27 @@ namespace StructureHelperCommon.Services.Forces
             CopyProperties(forceTuple, result, factor);
             return result;
         }
-        public static IForceTuple InterpolateTuples(IForceTuple endTuple, IForceTuple startTuple = null, double coefficient = 0.5d)
+        public static IForceTuple InterpolateTuples(IForceTuple startTuple, IForceTuple endTuple, double coefficient = 0.5d)
         {
             if (startTuple is null) startTuple = GetNewTupleSameType(endTuple);
             else { CheckTuples(startTuple, endTuple); }
             var deltaTuple = SumTuples(endTuple, startTuple, -1d);
             return SumTuples(startTuple, deltaTuple, coefficient);
         }
-        public static List<IDesignForceTuple> InterpolateDesignTuple(IDesignForceTuple finishDesignForce, IDesignForceTuple startDesignForce = null, int stepCount = 10)
+
+        public static List<IForceTuple> InterpolateTuples(IForceTuple startTuple, IForceTuple endTuple, int stepCount)
+        {
+            var tuples = new List<IForceTuple>();
+            double step = 1d / stepCount;
+            for (int i = 0; i <= stepCount; i++)
+            {
+                var interpolatedTuple = InterpolateTuples(startTuple, endTuple, i * step);
+                tuples.Add(interpolatedTuple);
+            }
+            return tuples;
+        }
+
+        public static List<IDesignForceTuple> InterpolateDesignTuple(IDesignForceTuple startDesignForce, IDesignForceTuple finishDesignForce, int stepCount = 10)
         {
             if (startDesignForce.LimitState != finishDesignForce.LimitState) throw new StructureHelperException(ErrorStrings.LimitStatesIsNotValid);
             if (startDesignForce.CalcTerm != finishDesignForce.CalcTerm) throw new StructureHelperException(ErrorStrings.LoadTermIsNotValid);
@@ -65,8 +78,12 @@ namespace StructureHelperCommon.Services.Forces
             double step = 1d / stepCount;
             for (int i = 0; i <= stepCount; i++)
             {
-                var currentTuple = InterpolateTuples(finishDesignForce.ForceTuple, startDesignForce.ForceTuple, i * step) as ForceTuple;
-                var currentDesignTuple = new DesignForceTuple() { LimitState = finishDesignForce.LimitState, CalcTerm = finishDesignForce.CalcTerm, ForceTuple = currentTuple };
+                var currentTuple = InterpolateTuples(startDesignForce.ForceTuple, finishDesignForce.ForceTuple, i * step);
+                var currentDesignTuple = new DesignForceTuple()
+                {
+                    LimitState = finishDesignForce.LimitState,
+                    CalcTerm = finishDesignForce.CalcTerm,
+                    ForceTuple = currentTuple };
                 tuples.Add(currentDesignTuple);
             }
             return tuples;
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ExtendedForceTupleCalculatorResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ExtendedForceTupleCalculatorResult.cs
new file mode 100644
index 0000000..13e037c
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ExtendedForceTupleCalculatorResult.cs
@@ -0,0 +1,12 @@
+using StructureHelperCommon.Models.States;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
+{
+    public class ExtendedForceTupleCalculatorResult : IExtendedForceTupleCalculatorResult
+    {
+        public IStateCalcTermPair StateCalcTermPair { get; set; } = new StateCalcTermPair();
+        public IForceTupleCalculatorResult ForcesTupleResult { get; set; }
+        public bool IsValid { get; set; } = true;
+        public string? Description { get; set; } = string.Empty;
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ExtendedForceTupleResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ExtendedForceTupleResult.cs
deleted file mode 100644
index c24a4ec..0000000
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ExtendedForceTupleResult.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using StructureHelperCommon.Models.States;
-
-namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
-{
-    public class ExtendedForceTupleResult : IExtendedForceTupleResult
-    {
-        public IStateCalcTermPair StateCalcTermPair { get; set; } = new StateCalcTermPair();
-        public IForcesTupleResult ForcesTupleResut { get; set; }
-    }
-}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs
index 1ed9f77..7a08fc9 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs
@@ -56,7 +56,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
             checkInputDataLogic.TraceLogger = TraceLogger;
             if (checkInputDataLogic.Check() != true)
             {
-                Result = new ForcesResults()
+                Result = new ForceCalculatorResult()
                 {
                     IsValid = false,
                     Description = checkInputDataLogic.CheckResult
@@ -72,11 +72,6 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
             Result = forceCalculatorLogic.GetForcesResults();
         }
 
-        private void GetResult()
-        {
-            throw new NotImplementedException();
-        }
-
         public object Clone()
         {
             var newCalculator = new ForceCalculator();
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorLogic.cs
index c1a47ca..5cfa870 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorLogic.cs
@@ -17,7 +17,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     /// <inheritdoc/>
     public class ForceCalculatorLogic : IForceCalculatorLogic
     {
-        private ForcesResults result;
+        private ForceCalculatorResult result;
         private IProcessorLogic<IForceTuple> eccentricityLogic;
         private ForceTupleBucklingLogic bucklingLogic;
         private ITriangulatePrimitiveLogic triangulateLogic;
@@ -28,7 +28,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
         public Action<IResult> ActionToOutputResults { get; set; }
 
 
-        public ForcesResults GetForcesResults()
+        public ForceCalculatorResult GetForcesResults()
         {
             TraceLogger?.AddMessage(LoggerStrings.LogicType(this), TraceLogStatuses.Service);
             TraceInputData();
@@ -67,7 +67,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         private void CalculateResult()
         {
-            result = new ForcesResults()
+            result = new ForceCalculatorResult()
             {
                 IsValid = true
             };
@@ -80,30 +80,30 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
                     if (InputData.LimitStatesList.Contains(limitState) & InputData.CalcTermsList.Contains(calcTerm))
                     {
 
-                        IForcesTupleResult tupleResult;
+                        ExtendedForceTupleCalculatorResult extendedResult = new();
+                        extendedResult.StateCalcTermPair.LimitState = limitState;
+                        extendedResult.StateCalcTermPair.CalcTerm = calcTerm;
                         try
                         {
-                            tupleResult = ProcessNdmResult(combination, tuple);
+                            IForceTupleCalculatorResult tupleResult = ProcessNdmResult(combination, tuple);
+                            extendedResult.IsValid = tupleResult.IsValid;
+                            extendedResult.ForcesTupleResult = tupleResult;
                         }
                         catch (Exception ex)
                         {
-                            tupleResult = new ForcesTupleResult()
-                            {
-                                IsValid = false,
-                                Description = string.Empty + ex,
-                                DesignForceTuple = tuple
-                            };
+                            extendedResult.IsValid = false;
+                            extendedResult.Description += ex.Message;
                         }
-                        result.ForcesResultList.Add(tupleResult);
+                        result.ForcesResultList.Add(extendedResult);
                         ActionToOutputResults?.Invoke(result);
                     }
                 }
             }
         }
 
-        private IForcesTupleResult ProcessNdmResult(IForceCombinationList combination, IDesignForceTuple tuple)
+        private IForceTupleCalculatorResult ProcessNdmResult(IForceCombinationList combination, IDesignForceTuple tuple)
         {
-            IForcesTupleResult tupleResult;
+            IForceTupleCalculatorResult tupleResult;
             LimitStates limitState = tuple.LimitState;
             CalcTerms calcTerm = tuple.CalcTerm;
             triangulateLogic = new TriangulatePrimitiveLogic()
@@ -130,7 +130,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
                 if (newTuple.Nz >= 0d)
                 {
                     TraceLogger?.AddMessage(string.Format("Second order effect is not considered as Nz={0} >= 0", newTuple.Nz));
-                    tupleResult = GetForceResult(limitState, calcTerm, ndms, newTuple);
+                    tupleResult = GetForceResult(ndms, newTuple);
                 }
                 else
                 {
@@ -144,14 +144,14 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
                     string message = string.Format("Second order effect is not considered, despite force Nz={0}", newTuple.Nz);
                     TraceLogger?.AddMessage(message, TraceLogStatuses.Warning);
                 }
-                tupleResult = GetForceResult(limitState, calcTerm, ndms, newTuple);
+                tupleResult = GetForceResult(ndms, newTuple);
             }
             return tupleResult;
         }
 
-        private IForcesTupleResult ProcessCompressedMember(IForceCombinationList combination, IDesignForceTuple tuple, List<INdm> ndms, IForceTuple newTuple)
+        private IForceTupleCalculatorResult ProcessCompressedMember(IForceCombinationList combination, IDesignForceTuple tuple, List<INdm> ndms, IForceTuple newTuple)
         {
-            IForcesTupleResult tupleResult;
+            IForceTupleCalculatorResult tupleResult;
             LimitStates limitState = tuple.LimitState;
             CalcTerms calcTerm = tuple.CalcTerm;
 
@@ -183,27 +183,24 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
             }
             else
             {
-                return new ForcesTupleResult()
+                return new ForceTupleCalculatorResult()
                 {
                     IsValid = false,
-                    DesignForceTuple = tuple,
+                    ForceTuple = tuple.ForceTuple,
                     Description = buckResult.Description,
                 };
             }
 
             string message = string.Intern("Result of second order was obtained successfully, new force combination was obtained");
             TraceLogger?.AddMessage(message);
-            tupleResult = GetForceResult(limitState, calcTerm, ndms, newTuple);
+            tupleResult = GetForceResult(ndms, newTuple);
             return tupleResult;
         }
 
-        private IForcesTupleResult GetForceResult(LimitStates limitState, CalcTerms calcTerm, List<INdm> ndms, IForceTuple newTuple)
+        private IForceTupleCalculatorResult GetForceResult(List<INdm> ndms, IForceTuple newTuple)
         {
             TraceLogger?.AddMessage("Calculation of cross-section is started");
             var tupleResult = GetPrimitiveStrainMatrix(ndms, newTuple, InputData.Accuracy);
-            tupleResult.DesignForceTuple.LimitState = limitState;
-            tupleResult.DesignForceTuple.CalcTerm = calcTerm;
-            tupleResult.DesignForceTuple.ForceTuple = newTuple;
             return tupleResult;
         }
 
@@ -217,7 +214,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
             }
         }
 
-        private IForcesTupleResult GetPrimitiveStrainMatrix(IEnumerable<INdm> ndmCollection, IForceTuple tuple, IAccuracy accuracy)
+        private IForceTupleCalculatorResult GetPrimitiveStrainMatrix(IEnumerable<INdm> ndmCollection, IForceTuple tuple, IAccuracy accuracy)
         {
             var inputData = new ForceTupleInputData()
             {
@@ -233,7 +230,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
                 calculator.TraceLogger = TraceLogger.GetSimilarTraceLogger();
             }
             calculator.Run();
-            return calculator.Result as IForcesTupleResult;
+            return calculator.Result as IForceTupleCalculatorResult;
         }
 
 
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorResult.cs
new file mode 100644
index 0000000..5620ab8
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculatorResult.cs
@@ -0,0 +1,9 @@
+namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
+{
+    public class ForceCalculatorResult : IForceCalculatorResult
+    {
+        public bool IsValid { get; set; }
+        public string Description { get; set; }
+        public List<IExtendedForceTupleCalculatorResult> ForcesResultList { get; } = [];
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs
index b43088d..b510777 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs
@@ -7,7 +7,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     /// <inheritdoc/>
     public class ForceTupleCalculator : IForceTupleCalculator
     {
-        IForcesTupleResult result;
+        IForceTupleCalculatorResult result;
         private ICheckInputDataLogic<IForceTupleInputData> checkInputDataLogic;
         private IForceTupleCalcLogic calcLogic;
 
@@ -56,7 +56,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         private void PrepareNewResult()
         {
-            result = new ForcesTupleResult()
+            result = new ForceTupleCalculatorResult()
             {
                 IsValid = true,
                 Description = string.Empty,
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForcesTupleResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculatorResult.cs
similarity index 76%
rename from StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForcesTupleResult.cs
rename to StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculatorResult.cs
index 6364792..18a8b96 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForcesTupleResult.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculatorResult.cs
@@ -9,10 +9,10 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 {
-    public class ForcesTupleResult : IForcesTupleResult
+    public class ForceTupleCalculatorResult : IForceTupleCalculatorResult
     {
         public bool IsValid { get; set; }
-        public IDesignForceTuple DesignForceTuple { get; set; }
+        public IForceTuple ForceTuple { get; set; } = new ForceTuple(Guid.NewGuid());
         /// <summary>
         /// Text of result of calculations
         /// </summary>
@@ -23,10 +23,5 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
         public ILoaderResults LoaderResults { get; set; }
 
         public IForceTupleInputData InputData { get; set; }
-
-        public ForcesTupleResult()
-        {
-            DesignForceTuple = new DesignForceTuple();
-        }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForcesResults.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForcesResults.cs
deleted file mode 100644
index b7dcde8..0000000
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForcesResults.cs
+++ /dev/null
@@ -1,20 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
-{
-    public class ForcesResults : IForcesResults
-    {
-        public bool IsValid { get; set; }
-        public List<IForcesTupleResult> ForcesResultList { get; }
-        public string Description { get; set; }
-
-        public ForcesResults()
-        {
-            ForcesResultList = new List<IForcesTupleResult>();
-        }
-    }
-}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IExtendedForceTupleCalculatorResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IExtendedForceTupleCalculatorResult.cs
new file mode 100644
index 0000000..24d1add
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IExtendedForceTupleCalculatorResult.cs
@@ -0,0 +1,11 @@
+using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.States;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
+{
+    public interface IExtendedForceTupleCalculatorResult : IResult
+    {
+        IStateCalcTermPair StateCalcTermPair { get; set; }
+        IForceTupleCalculatorResult ForcesTupleResult { get; set; }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IExtendedForceTupleResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IExtendedForceTupleResult.cs
deleted file mode 100644
index ea193fe..0000000
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IExtendedForceTupleResult.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using StructureHelperCommon.Models.States;
-
-namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
-{
-    public interface IExtendedForceTupleResult
-    {
-        IStateCalcTermPair StateCalcTermPair { get; set; }
-        IForcesTupleResult ForcesTupleResut { get; set; }
-    }
-}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorLogic.cs
index 46178aa..1d209e7 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorLogic.cs
@@ -14,6 +14,6 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     public interface IForceCalculatorLogic : ILogic, IHasActionByResult
     {
         IForceCalculatorInputData InputData { get; set; }
-        ForcesResults GetForcesResults();
+        ForceCalculatorResult GetForcesResults();
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForcesResults.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorResult.cs
similarity index 65%
rename from StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForcesResults.cs
rename to StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorResult.cs
index 895f687..433b36e 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForcesResults.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceCalculatorResult.cs
@@ -3,10 +3,10 @@ using System.Collections.Generic;
 
 namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 {
-    public interface IForcesResults : IResult
+    public interface IForceCalculatorResult : IResult
     {
-        string Description { get; set; }
-        List<IForcesTupleResult> ForcesResultList { get; }
         bool IsValid { get; set; }
+        string Description { get; set; }
+        List<IExtendedForceTupleCalculatorResult> ForcesResultList { get; }
     }
 }
\ No newline at end of file
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForcesTupleResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceTupleCalculatorResult.cs
similarity index 74%
rename from StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForcesTupleResult.cs
rename to StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceTupleCalculatorResult.cs
index 53ecd15..c755d09 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForcesTupleResult.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/IForceTupleCalculatorResult.cs
@@ -4,10 +4,10 @@ using StructureHelperCommon.Models.Forces;
 
 namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 {
-    public interface IForcesTupleResult : IResult
+    public interface IForceTupleCalculatorResult : IResult
     {
         IForceTupleInputData InputData { get; set; }
-        IDesignForceTuple DesignForceTuple { get; set; }
+        IForceTuple ForceTuple { get; set; }
         ILoaderResults LoaderResults { get; set; }
     }
 }
\ No newline at end of file
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleCalcLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleCalcLogic.cs
index df453b5..0ff9f29 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleCalcLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleCalcLogic.cs
@@ -18,7 +18,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 {
     public class ForceTupleCalcLogic : IForceTupleCalcLogic
     {
-        private IForcesTupleResult result;
+        private IForceTupleCalculatorResult result;
         private ForceTupleTraceResultLogic forceTupleTraceResultLogic;
         private LoaderOptions loaderData;
         private Calculator calculator;
@@ -27,7 +27,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         public IForceTupleInputData InputData { get; set; }
 
-        public IForcesTupleResult Result => result;
+        public IForceTupleCalculatorResult Result => result;
 
         public IShiftTraceLogger? TraceLogger { get; set; }
         public Action<IResult> ActionToOutputResults { get; set; }
@@ -40,7 +40,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         private void PrepareNewResult()
         {
-            result = new ForcesTupleResult()
+            result = new ForceTupleCalculatorResult()
             {
                 IsValid = true,
                 Description = string.Empty,
@@ -117,6 +117,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
         private void ProcessCorrectLoaderResult()
         {
             result.IsValid = true;
+            result.ForceTuple = InputData.ForceTuple;
             result.Description = LoggerStrings.CalculationHasDone;
             result.LoaderResults = calcResult;
             forceTupleTraceResultLogic = new ForceTupleTraceResultLogic(InputData.NdmCollection)
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleTraceResultLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleTraceResultLogic.cs
index f7d63aa..223cc83 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleTraceResultLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ForceTupleTraceResultLogic.cs
@@ -24,11 +24,11 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         public void TraceResult(IResult result)
         {
-            if (result is not IForcesTupleResult)
+            if (result is not IForceTupleCalculatorResult)
             {
                 throw new StructureHelperException(ErrorStrings.ObjectTypeIsUnknownObj(result));
             }
-            calcResult = ((IForcesTupleResult)result).LoaderResults;
+            calcResult = ((IForceTupleCalculatorResult)result).LoaderResults;
             TraceLogger?.AddMessage($"Analysis of internal forces is done succsesfully");
             TraceLogger?.AddMessage($"Current accuracy {calcResult.AccuracyRate} has achieved in {calcResult.IterationCounter} iteration", TraceLogStatuses.Debug);
             var strainMatrix = calcResult.ForceStrainPair.StrainMatrix;
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IForceTupleCalcLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IForceTupleCalcLogic.cs
index e709e04..48da8d0 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IForceTupleCalcLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IForceTupleCalcLogic.cs
@@ -11,7 +11,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     public interface IForceTupleCalcLogic: ILogic, IHasActionByResult
     {
         IForceTupleInputData InputData { get; set; }
-        IForcesTupleResult Result { get; }
+        IForceTupleCalculatorResult Result { get; }
         void Calculate();
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs
index 3000ee5..17dba11 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs
@@ -10,6 +10,6 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     public interface IProcessTupleLogic : ILogic
     {
         IForceTupleInputData InputData { get; set; }
-        IForcesTupleResult ProcessNdmResult();
+        IForceTupleCalculatorResult ProcessNdmResult();
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/InterpolationProgressLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/InterpolationProgressLogic.cs
index 84f2dbe..fdf0d0c 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/InterpolationProgressLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/InterpolationProgressLogic.cs
@@ -2,6 +2,7 @@
 using StructureHelperCommon.Models;
 using StructureHelperCommon.Models.Calculators;
 using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.States;
 using StructureHelperLogics.Services.NdmCalculations;
 using System.ComponentModel;
 
@@ -9,12 +10,13 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces.Logics
 {
     public class InterpolationProgressLogic : ILongProcessLogic
     {
-        private ForceCalculator forceCalculator;
+        private IForceCalculator forceCalculator;
+        private IStateCalcTermPair stateCalcTermPair;
         private InterpolateTuplesResult interpolateTuplesResult;
 
         public Action<int> SetProgress { get; set; }
 
-        public ForceCalculator InterpolateCalculator { get; private set; }
+        public IForceCalculator InterpolateCalculator { get; private set; }
         public bool Result { get; set; }
 
         public int StepCount => interpolateTuplesResult.StepCount + 1;
@@ -23,7 +25,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces.Logics
 
         public void WorkerDoWork(object sender, DoWorkEventArgs e)
         {
-            InterpolateCalculator = InterpolateService.InterpolateForceCalculator(forceCalculator, interpolateTuplesResult);
+            InterpolateCalculator = InterpolateService.InterpolateForceCalculator(forceCalculator, stateCalcTermPair, interpolateTuplesResult);
             InterpolateCalculator.ActionToOutputResults = ShowProgressResult;
             InterpolateCalculator.Run();
         }
@@ -38,17 +40,18 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces.Logics
             //nothing to do
         }
 
-        public InterpolationProgressLogic(ForceCalculator forceCalculator, InterpolateTuplesResult interpolateTuplesResult)
+        public InterpolationProgressLogic(IForceCalculator forceCalculator, IStateCalcTermPair stateCalcTermPair, InterpolateTuplesResult interpolateTuplesResult)
         {
             this.forceCalculator = forceCalculator;
+            this.stateCalcTermPair = stateCalcTermPair;
             this.interpolateTuplesResult = interpolateTuplesResult;
         }
 
         private void ShowProgressResult(IResult result)
         {
-            if (result is ForcesResults)
+            if (result is ForceCalculatorResult)
             {
-                var forceResult = result as ForcesResults;
+                var forceResult = result as ForceCalculatorResult;
                 SetProgress?.Invoke(forceResult.ForcesResultList.Count());
                 Result = forceResult.IsValid;
             }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs
index 979c71a..9fddb45 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs
@@ -12,7 +12,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
         public IShiftTraceLogger? TraceLogger { get; set; }
         IForceTupleInputData IProcessTupleLogic.InputData { get; set; }
 
-        public IForcesTupleResult ProcessNdmResult()
+        public IForceTupleCalculatorResult ProcessNdmResult()
         {
             throw new NotImplementedException();
         }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceForcesResultLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceForcesResultLogic.cs
index 50b9b01..01efa37 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceForcesResultLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceForcesResultLogic.cs
@@ -14,11 +14,11 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     /// <summary>
     /// Provides trace logger inforvation for collection of force tuple results
     /// </summary>
-    public class TraceForcesResultLogic : ITraceCollectionLogic<IForcesTupleResult>
+    public class TraceForcesResultLogic : ITraceCollectionLogic<IExtendedForceTupleCalculatorResult>
     {
         const int rowSize = 4;
         private List<ITraceLoggerEntry> traceLoggerEntries;
-        public IEnumerable<IForcesTupleResult>? Collection { get; set; }
+        public IEnumerable<IExtendedForceTupleCalculatorResult>? Collection { get; set; }
         public int Priority { get; set; } = LoggerService.GetPriorityByStatus(TraceLogStatuses.Info);
 
         public List<ITraceLoggerEntry> GetTraceEntries()
@@ -51,7 +51,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
             traceLoggerEntries.Add(table);
         }
 
-        private IEnumerable<IShTableRow<ITraceLoggerEntry>> ProcessForceTupleResult(IForcesTupleResult item)
+        private IEnumerable<IShTableRow<ITraceLoggerEntry>> ProcessForceTupleResult(IExtendedForceTupleCalculatorResult item)
         {
             List<IShTableRow<ITraceLoggerEntry>> rows = new();
             int priority = Priority;
@@ -63,19 +63,19 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
             ndmRow = new(rowSize);
             ndmRow.Elements[0].Value = new StringLogEntry()
             {
-                Message = TraceStringService.GetLimitStateAndCalctTerm(item.DesignForceTuple),
+                Message = TraceStringService.GetLimitStateAndCalctTerm(item.StateCalcTermPair),
                 Priority = priority
             };
             ndmRow.Elements[1].Value = new StringLogEntry()
             {
-                Message = TraceStringService.GetForces(item.DesignForceTuple.ForceTuple),
+                Message = TraceStringService.GetForces(item.ForcesTupleResult.ForceTuple),
                 Priority = priority
             };
-            if (item.LoaderResults is not null)
+            if (item.ForcesTupleResult.LoaderResults is not null)
             {
                 ndmRow.Elements[2].Value = new StringLogEntry()
                 {
-                    Message = TraceStringService.GetCuvatures(item.LoaderResults.ForceStrainPair.StrainMatrix),
+                    Message = TraceStringService.GetCuvatures(item.ForcesTupleResult.LoaderResults.ForceStrainPair.StrainMatrix),
                     Priority = priority
                 };
             }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceStringService.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceStringService.cs
index a217789..5d3f3d3 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceStringService.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/TraceStringService.cs
@@ -1,5 +1,7 @@
 using LoaderCalculator.Data.Matrix;
+using StructureHelperCommon.Infrastructures.Enums;
 using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.States;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -10,11 +12,21 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 {
     public static class TraceStringService
     {
+        public static string GetLimitStateAndCalctTerm(LimitStates limitState, CalcTerms calcTerm)
+        {
+            string s = "Limit state: " + limitState.ToString();
+            s += ", Calculation term: " + calcTerm.ToString();
+            return s;
+        }
+
         public static string GetLimitStateAndCalctTerm(IDesignForceTuple designForceTuple)
         {
-            string s = "Limit state: " + designForceTuple.LimitState.ToString();
-            s += ", Calculation term: " + designForceTuple.CalcTerm;
-            return s;
+            return GetLimitStateAndCalctTerm(designForceTuple.LimitState, designForceTuple.CalcTerm);
+        }
+
+        public static string GetLimitStateAndCalctTerm(IStateCalcTermPair stateCalcTermPair)
+        {
+            return GetLimitStateAndCalctTerm(stateCalcTermPair.LimitState, stateCalcTermPair.CalcTerm);
         }
 
         public static string GetForces(IForceTuple forceTuple)
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ExportForcesResultToCSVLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ExportForcesResultToCSVLogic.cs
index 123ac72..549b34e 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ExportForcesResultToCSVLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ExportForcesResultToCSVLogic.cs
@@ -6,9 +6,9 @@ namespace StructureHelperLogics.NdmCalculations.Analyses
     public class ExportForcesResultToCSVLogic : ExportToCSVLogicBase
     {
         private const string errorString = "-error-";
-        IForcesResults results;
+        IForceCalculatorResult results;
 
-        public ExportForcesResultToCSVLogic(IForcesResults results)
+        public ExportForcesResultToCSVLogic(IForceCalculatorResult results)
         {
             this.results = results;
         }
@@ -34,11 +34,11 @@ namespace StructureHelperLogics.NdmCalculations.Analyses
             {
                 //if (item.IsValid == true)
                 {
-                    var tuple = item.DesignForceTuple.ForceTuple;
+                    var tuple = item.ForcesTupleResult.ForceTuple;
                     LoaderCalculator.Data.Matrix.IStrainMatrix strainMatrix = null;
                     try
                     {
-                        strainMatrix = item.LoaderResults.StrainMatrix;
+                        strainMatrix = item.ForcesTupleResult.LoaderResults.StrainMatrix;
                     }
                     catch (Exception ex)
                     {
@@ -46,8 +46,8 @@ namespace StructureHelperLogics.NdmCalculations.Analyses
                     }
                     string[] newLine =
                         {
-                            item.DesignForceTuple.LimitState.ToString() ?? errorString,
-                            item.DesignForceTuple.CalcTerm.ToString() ?? errorString,
+                            item.StateCalcTermPair.LimitState.ToString() ?? errorString,
+                            item.StateCalcTermPair.CalcTerm.ToString() ?? errorString,
                             tuple.Mx.ToString() ?? errorString,
                             tuple.My.ToString() ?? errorString,
                             tuple.Nz.ToString() ?? errorString,
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/IValueDiagramCalculatorResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/IValueDiagramCalculatorResult.cs
index b01a40d..9678551 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/IValueDiagramCalculatorResult.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/IValueDiagramCalculatorResult.cs
@@ -8,6 +8,6 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ValueDiagrams
     {
         IValueDiagramCalculatorInputData? InputData { get; set; }
         List<IPoint2D> Points { get; set; }
-        List<IForcesTupleResult> ForceTupleResults { get; set; }
+        List<IForceTupleCalculatorResult> ForceTupleResults { get; set; }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/ValueDiagramCalculatorResult.cs b/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/ValueDiagramCalculatorResult.cs
index 4adaca9..4c579cc 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/ValueDiagramCalculatorResult.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/ValueDiagramCalculatorResult.cs
@@ -9,7 +9,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ValueDiagrams
 
         public List<IPoint2D> Points { get; set; } = [];
 
-        public List<IForcesTupleResult> ForceTupleResults { get; set; } = [];
+        public List<IForceTupleCalculatorResult> ForceTupleResults { get; set; } = [];
 
         public bool IsValid { get; set; } = true;
         public string? Description { get; set; } = string.Empty;
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs b/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs
index 8b446b2..963c7b5 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs
@@ -24,7 +24,7 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
         private List<INdm> ndmCollection;
         private List<INdm> concreteNdms;
         private List<INdm> otherNdms;
-        IForcesTupleResult forcesResults;
+        IForceTupleCalculatorResult forcesResults;
         private ITriangulatePrimitiveLogic triangulateLogic;
 
         public IResult Result { get; private set; }
@@ -242,7 +242,7 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
             }
             IForceTupleCalculator calculator = GetForceCalculator();
             calculator.Run();
-            forcesResults = calculator.Result as IForcesTupleResult;
+            forcesResults = calculator.Result as IForceTupleCalculatorResult;
             if (forcesResults.IsValid != true)
             {
                 result += "Bearind capacity of cross-section is not enough for initial forces\n";
diff --git a/StructureHelperLogics/NdmCalculations/Cracking/CrackForceBynarySearchCalculator.cs b/StructureHelperLogics/NdmCalculations/Cracking/CrackForceBynarySearchCalculator.cs
index 2f62540..c7e7ed7 100644
--- a/StructureHelperLogics/NdmCalculations/Cracking/CrackForceBynarySearchCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Cracking/CrackForceBynarySearchCalculator.cs
@@ -125,7 +125,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
             }
             softeningLogic.ForceRatio = factorOfCrackAppearance;
             var psiS = softeningLogic.GetSofteningFactor();
-            var tupleOfCrackApeearence = ForceTupleService.InterpolateTuples(InputData.EndTuple, InputData.StartTuple, factorOfCrackAppearance);
+            var tupleOfCrackApeearence = ForceTupleService.InterpolateTuples(InputData.StartTuple, InputData.EndTuple, factorOfCrackAppearance);
             TraceLogger?.AddMessage($"Crack is appeared in force combination");
             TraceLogger?.AddEntry(new TraceTablesFactory().GetByForceTuple(tupleOfCrackApeearence));
             var reducedStrainTuple = GetReducedStrainTuple(factorOfCrackAppearance, psiS);
@@ -158,7 +158,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
         private StrainTuple GetReducedStrainTuple(double factorOfCrackAppearance, double softeningFactor)
         {
             const double notCrackedForceFactor = 0.99d;
-            var notCrackedForceTuple = ForceTupleService.InterpolateTuples(InputData.EndTuple, InputData.StartTuple, factorOfCrackAppearance * notCrackedForceFactor) as ForceTuple;
+            var notCrackedForceTuple = ForceTupleService.InterpolateTuples(InputData.StartTuple, InputData.EndTuple, factorOfCrackAppearance * notCrackedForceFactor) as ForceTuple;
             var crackAppearanceStrainTuple = GetStrainTuple(notCrackedForceTuple);
             var actualStrainTuple = GetStrainTuple(InputData.EndTuple);
             crackStrainLogic.BeforeCrackingTuple = crackAppearanceStrainTuple;
@@ -197,7 +197,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
             inputData.ForceTuple = forceTuple;
             forceTupleCalculator.InputData = inputData;
             forceTupleCalculator.Run();
-            var result = forceTupleCalculator.Result as IForcesTupleResult;
+            var result = forceTupleCalculator.Result as IForceTupleCalculatorResult;
             var loaderStrainMatrix = result.LoaderResults.ForceStrainPair.StrainMatrix;
             StrainTuple strainTuple = TupleConverter.ConvertToStrainTuple(loaderStrainMatrix);
             return strainTuple;
diff --git a/StructureHelperLogics/NdmCalculations/Cracking/CrackStrainLogic.cs b/StructureHelperLogics/NdmCalculations/Cracking/CrackStrainLogic.cs
index 3dd213d..af397f7 100644
--- a/StructureHelperLogics/NdmCalculations/Cracking/CrackStrainLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Cracking/CrackStrainLogic.cs
@@ -16,7 +16,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
 
         public StrainTuple GetCrackedStrainTuple()
         {
-            var strainTuple = ForceTupleService.InterpolateTuples(AfterCrackingTuple, BeforeCrackingTuple, SofteningFactor) as StrainTuple;
+            var strainTuple = ForceTupleService.InterpolateTuples(BeforeCrackingTuple, AfterCrackingTuple, SofteningFactor) as StrainTuple;
             return strainTuple;
         }
     }
diff --git a/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByFactorLogic.cs b/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByFactorLogic.cs
index 4b7a6d6..ca89be0 100644
--- a/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByFactorLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByFactorLogic.cs
@@ -31,7 +31,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
         public bool IsSectionCracked(double factor)
         {
             IsSectionCrackedByForceLogic.TraceLogger ??= TraceLogger?.GetSimilarTraceLogger(50);
-            var actualTuple = ForceTupleService.InterpolateTuples(EndTuple, StartTuple, factor);
+            var actualTuple = ForceTupleService.InterpolateTuples(StartTuple, EndTuple, factor);
             IsSectionCrackedByForceLogic.Tuple = actualTuple;
             return IsSectionCrackedByForceLogic.IsSectionCracked();
         }
diff --git a/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByForceLogic.cs b/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByForceLogic.cs
index 54601f1..2f8e61f 100644
--- a/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByForceLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Cracking/IsSectionCrackedByForceLogic.cs
@@ -49,7 +49,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
                 calculator.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
             }
             calculator.Run();
-            var calcResult = calculator.Result as ForcesTupleResult;
+            var calcResult = calculator.Result as ForceTupleCalculatorResult;
             if (calcResult.IsValid == false)
             {
                 TraceLogger?.AddMessage($"Result of calculation is not valid {calcResult.Description}", TraceLogStatuses.Error);
diff --git a/StructureHelperLogics/NdmCalculations/Cracking/RebarStressCalculator.cs b/StructureHelperLogics/NdmCalculations/Cracking/RebarStressCalculator.cs
index 574dbbb..50fd4ea 100644
--- a/StructureHelperLogics/NdmCalculations/Cracking/RebarStressCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Cracking/RebarStressCalculator.cs
@@ -88,7 +88,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
                 //TraceLogger = TraceLogger?.GetSimilarTraceLogger(50)
             };
             calculator.Run();
-            var forceResult = calculator.Result as IForcesTupleResult;
+            var forceResult = calculator.Result as IForceTupleCalculatorResult;
             if (forceResult.IsValid == false)
             {
                 //TraceLogger?.AddMessage(LoggerStrings.CalculationError + $": {forceResult.Description}", TraceLogStatuses.Error);
diff --git a/StructureHelperLogics/NdmCalculations/Cracking/TupleCrackCalculator.cs b/StructureHelperLogics/NdmCalculations/Cracking/TupleCrackCalculator.cs
index 031b32a..e6b55b2 100644
--- a/StructureHelperLogics/NdmCalculations/Cracking/TupleCrackCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Cracking/TupleCrackCalculator.cs
@@ -167,7 +167,7 @@ namespace StructureHelperLogics.NdmCalculations.Cracking
                 //TraceLogger = TraceLogger?.GetSimilarTraceLogger(50)
             };
             calculator.Run();
-            var forceResult = calculator.Result as IForcesTupleResult;
+            var forceResult = calculator.Result as IForceTupleCalculatorResult;
             if (forceResult.IsValid == false)
             {
                 result.IsValid = false;
diff --git a/StructureHelperLogics/Services/NdmCalculations/InterpolateService.cs b/StructureHelperLogics/Services/NdmCalculations/InterpolateService.cs
index 6ee7152..d1ab1cd 100644
--- a/StructureHelperLogics/Services/NdmCalculations/InterpolateService.cs
+++ b/StructureHelperLogics/Services/NdmCalculations/InterpolateService.cs
@@ -1,5 +1,6 @@
 using StructureHelperCommon.Models.Forces;
 using StructureHelperCommon.Models.Sections;
+using StructureHelperCommon.Models.States;
 using StructureHelperCommon.Services.Forces;
 using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
 
@@ -8,19 +9,19 @@ namespace StructureHelperLogics.Services.NdmCalculations
     public static class InterpolateService
     {
         static readonly CompressedMemberUpdateStrategy compressedMemberUpdateStrategy = new();
-        public static ForceCalculator InterpolateForceCalculator(ForceCalculator source, InterpolateTuplesResult interpolateTuplesResult)
+        public static ForceCalculator InterpolateForceCalculator(IForceCalculator source, IStateCalcTermPair stateCalcTermPair, InterpolateTuplesResult interpolateTuplesResult)
         {
             ForceCalculator calculator = new ForceCalculator();
             calculator.InputData.LimitStatesList.Clear();
-            calculator.InputData.LimitStatesList.Add(interpolateTuplesResult.StartTuple.LimitState);
+            calculator.InputData.LimitStatesList.Add(stateCalcTermPair.LimitState);
             calculator.InputData.CalcTermsList.Clear();
-            calculator.InputData.CalcTermsList.Add(interpolateTuplesResult.FinishTuple.CalcTerm);
+            calculator.InputData.CalcTermsList.Add(stateCalcTermPair.CalcTerm);
             compressedMemberUpdateStrategy.Update(calculator.InputData.CompressedMember, source.InputData.CompressedMember);
             calculator.InputData.Accuracy = source.InputData.Accuracy;
             calculator.InputData.Primitives.AddRange(source.InputData.Primitives);
             calculator.InputData.ForceActions.Clear();
             calculator.InputData.CheckStrainLimit = source.InputData.CheckStrainLimit;
-            var forceTuples = ForceTupleService.InterpolateDesignTuple(interpolateTuplesResult.FinishTuple, interpolateTuplesResult.StartTuple, interpolateTuplesResult.StepCount);
+            var forceTuples = ForceTupleService.InterpolateTuples(interpolateTuplesResult.StartTuple, interpolateTuplesResult.FinishTuple, interpolateTuplesResult.StepCount);
             foreach (var forceTuple in forceTuples)
             {
                 var combination = new ForceCombinationList()
@@ -29,7 +30,13 @@ namespace StructureHelperLogics.Services.NdmCalculations
                     SetInGravityCenter = false
                 };
                 combination.DesignForces.Clear();
-                combination.DesignForces.Add(forceTuple);
+                DesignForceTuple designForceTuple = new()
+                {
+                    LimitState = stateCalcTermPair.LimitState,
+                    CalcTerm = stateCalcTermPair.CalcTerm,
+                    ForceTuple = forceTuple,
+                };
+                combination.DesignForces.Add(designForceTuple);
                 combination.ForcePoint.X = 0;
                 combination.ForcePoint.Y = 0;
                 calculator.InputData.ForceActions.Add(combination);
diff --git a/StructureHelperTests/FunctionalTests/Ndms/Calculators/ForceCalculatorTests/RCSectionsTest.cs b/StructureHelperTests/FunctionalTests/Ndms/Calculators/ForceCalculatorTests/RCSectionsTest.cs
index 9354298..314503d 100644
--- a/StructureHelperTests/FunctionalTests/Ndms/Calculators/ForceCalculatorTests/RCSectionsTest.cs
+++ b/StructureHelperTests/FunctionalTests/Ndms/Calculators/ForceCalculatorTests/RCSectionsTest.cs
@@ -27,11 +27,11 @@ namespace StructureHelperTests.FunctionalTests.Ndms.Calculators.ForceCalculatorT
             calculator.InputData.CompressedMember.Buckling = isBuckling;
             //Act
             calculator.Run();
-            var result = calculator.Result as IForcesResults;
+            var result = calculator.Result as IForceCalculatorResult;
             //Assert
             Assert.That(result, Is.Not.Null);
             Assert.That(result.IsValid, Is.True);
-            var strainMatrix = result.ForcesResultList[0].LoaderResults.StrainMatrix;
+            var strainMatrix = result.ForcesResultList[0].ForcesTupleResult.LoaderResults.StrainMatrix;
             var kx = strainMatrix.Kx;
             var ky = strainMatrix.Ky;
             var epsz = strainMatrix.EpsZ;
@@ -52,7 +52,7 @@ namespace StructureHelperTests.FunctionalTests.Ndms.Calculators.ForceCalculatorT
             calculator.InputData.CompressedMember.Buckling = isBuckling;
             //Act
             calculator.Run();
-            var result = calculator.Result as IForcesResults;
+            var result = calculator.Result as IForceCalculatorResult;
             //Assert
             Assert.That(result, Is.Not.Null);
             Assert.That(calcResult == result.IsValid, Is.True);
@@ -69,8 +69,8 @@ namespace StructureHelperTests.FunctionalTests.Ndms.Calculators.ForceCalculatorT
             calculator.InputData.CompressedMember.Buckling = false;
             calculator.Run();
             var ndmPrimitives = newSection.SectionRepository.Primitives;
-            var result = calculator.Result as IForcesResults;
-            var strainMatrix = result.ForcesResultList[0].LoaderResults.StrainMatrix;
+            var result = calculator.Result as IForceCalculatorResult;
+            var strainMatrix = result.ForcesResultList[0].ForcesTupleResult.LoaderResults.StrainMatrix;
             var source = TupleConverter.ConvertToStrainTuple(strainMatrix);
             //Act
             foreach (var item in ndmPrimitives)
@@ -78,11 +78,11 @@ namespace StructureHelperTests.FunctionalTests.Ndms.Calculators.ForceCalculatorT
                 ForceTupleService.CopyProperties(source, item.NdmElement.AutoPrestrain);
             }
             calculator.Run();
-            var result2 = calculator.Result as IForcesResults;
+            var result2 = calculator.Result as IForceCalculatorResult;
             //Assert
             Assert.That(result2, Is.Not.Null);
             Assert.That(result2.IsValid, Is.True);
-            var strainMatrix2 = result2.ForcesResultList[0].LoaderResults.StrainMatrix;
+            var strainMatrix2 = result2.ForcesResultList[0].ForcesTupleResult.LoaderResults.StrainMatrix;
             var kx = strainMatrix2.Kx;
             var ky = strainMatrix2.Ky;
             var epsz = strainMatrix2.EpsZ;