diff --git a/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentVM.cs b/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentVM.cs
index 7fa11e6..cc5339f 100644
--- a/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentVM.cs
+++ b/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentVM.cs
@@ -22,26 +22,29 @@ namespace StructureHelper.Windows.CalculationWindows.ProgressViews
         private FlowDocument document;
         private ICommand rebuildCommand;
         private ICommand printDocumentCommand;
-        private int maxPriority;
+        private int priorityLimit;
         private int tabGap;
 
         public FlowDocumentReader DocumentReader { get; set; }
-        public int MaxPriority
+        public int PriorityLimit
         {
-            get => maxPriority; set
+            get => priorityLimit; set
             {
-                var oldValue = maxPriority;
+                var oldValue = priorityLimit;
                 try
                 {
-                    maxPriority = Math.Max(value, 0);
-                    OnPropertyChanged(nameof(MaxPriority));
+                    priorityLimit = Math.Max(value, 0);
+                    OnPropertyChanged(nameof(PriorityLimit));
                 }
                 catch (Exception)
                 {
-                    maxPriority = oldValue;
+                    priorityLimit = oldValue;
                 }
             }
         }
+
+        public int MaxPriority => loggerEntries.Max(x => x.Priority);
+
         public int TabGap
         {
             get => tabGap; set
@@ -61,7 +64,7 @@ namespace StructureHelper.Windows.CalculationWindows.ProgressViews
         public TraceDocumentVM(IEnumerable<ITraceLoggerEntry> loggerEntries)
         {
             this.loggerEntries = loggerEntries;
-            maxPriority = 350;
+            priorityLimit = 350;
             tabGap = 30;
         }
 
@@ -81,7 +84,7 @@ namespace StructureHelper.Windows.CalculationWindows.ProgressViews
         public void Prepare()
         {
             document = new();
-            selectedLoggerEntries = loggerEntries.Where(x => x.Priority <= MaxPriority);
+            selectedLoggerEntries = loggerEntries.Where(x => x.Priority <= PriorityLimit);
             var blocks = selectedLoggerEntries.Select(x => GetBlockByEntry(x));
             document.Blocks.AddRange(blocks);
         }
diff --git a/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentView.xaml b/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentView.xaml
index c1c5a39..5d8f958 100644
--- a/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentView.xaml
+++ b/StructureHelper/Windows/CalculationWindows/ProgressViews/TraceDocumentView.xaml
@@ -10,7 +10,7 @@
     <Grid>
         <Grid.ColumnDefinitions>
             <ColumnDefinition Width="*"/>
-            <ColumnDefinition Width="90"/>
+            <ColumnDefinition Width="120"/>
         </Grid.ColumnDefinitions>
         <FlowDocumentReader Name="DocumentReader" ViewingMode="Scroll"/>
         <StackPanel Grid.Column="1">
@@ -18,7 +18,13 @@
                 <TextBox Text="{Binding TabGap, ValidatesOnExceptions=True}" />
             </GroupBox>
             <GroupBox Header="Max priority">
-                <TextBox Text="{Binding MaxPriority, ValidatesOnExceptions=True}" />
+                <StackPanel>
+                    <TextBox Text="{Binding PriorityLimit, ValidatesOnExceptions=True}" />
+                    <StackPanel Orientation="Horizontal">
+                        <Slider Width="88" Value="{Binding PriorityLimit}" Maximum="{Binding MaxPriority}" Minimum="0"/>
+                        <TextBlock Width="20" FontSize="8" Text="{Binding MaxPriority}"/>
+                    </StackPanel>
+                </StackPanel>
             </GroupBox>
             <Button Margin="3" Content="Rebuild" ToolTip="Rebuild document" Command="{Binding RebuildCommand}"/>
             <Button Margin="3" Content="Print" ToolTip="Print document" Command="{Binding PrintDocumentCommand}"/>
diff --git a/StructureHelper/Windows/ViewModels/NdmCrossSections/AnalysisViewModelLogic.cs b/StructureHelper/Windows/ViewModels/NdmCrossSections/AnalysisViewModelLogic.cs
index a496c48..1e0d167 100644
--- a/StructureHelper/Windows/ViewModels/NdmCrossSections/AnalysisViewModelLogic.cs
+++ b/StructureHelper/Windows/ViewModels/NdmCrossSections/AnalysisViewModelLogic.cs
@@ -128,16 +128,14 @@ namespace StructureHelper.Windows.ViewModels.NdmCrossSections
 
         private void RunCalculator()
         {
+            if (SelectedItem.TraceLogger is not null)
+            {
+                SelectedItem.TraceLogger.TraceLoggerEntries.Clear();
+            }
             if (SelectedItem is LimitCurvesCalculator calculator)
             {
-                if (calculator.TraceLogger is not null) { calculator.TraceLogger.TraceLoggerEntries.Clear(); }
                 var inputData = calculator.InputData;
                 ShowInteractionDiagramByInputData(calculator);
-                if (calculator.TraceLogger is not null)
-                {
-                    var wnd = new TraceDocumentView(calculator.TraceLogger.TraceLoggerEntries);
-                    wnd.ShowDialog();
-                }
             }
             else
             {
@@ -146,13 +144,17 @@ namespace StructureHelper.Windows.ViewModels.NdmCrossSections
                 if (result.IsValid == false)
                 {
                     MessageBox.Show(result.Description, "Check data for analisys", MessageBoxButtons.OK, MessageBoxIcon.Warning);
-                    return;
                 }
                 else
                 {
                     ProcessResult();
                 }
             }
+            if (SelectedItem.TraceLogger is not null)
+            {
+                var wnd = new TraceDocumentView(SelectedItem.TraceLogger.TraceLoggerEntries);
+                wnd.ShowDialog();
+            }
         }
 
         private void ShowInteractionDiagramByInputData(LimitCurvesCalculator calculator)
diff --git a/StructureHelperCommon/Models/Loggers/LoggerStrings.cs b/StructureHelperCommon/Models/Loggers/LoggerStrings.cs
new file mode 100644
index 0000000..3aef8ea
--- /dev/null
+++ b/StructureHelperCommon/Models/Loggers/LoggerStrings.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Loggers
+{
+    public static class LoggerStrings
+    {
+        public static string DimensionLess => "(dimensionless)";
+        public static string MethodBasedOn => "Method of calculation based on ";
+        public static string CalculationHasDone => "Calculation has done succesfully";
+        public static string CalculatorType(object obj) => string.Format("Calculator type: {0}", obj.GetType());
+    }
+}
diff --git a/StructureHelperCommon/Models/Sections/CompressedMember.cs b/StructureHelperCommon/Models/Sections/CompressedMember.cs
index 09a1311..7a0feae 100644
--- a/StructureHelperCommon/Models/Sections/CompressedMember.cs
+++ b/StructureHelperCommon/Models/Sections/CompressedMember.cs
@@ -1,13 +1,24 @@
 namespace StructureHelperCommon.Models.Sections
 {
+
+    //Copyright (c) 2023 Redikultsev Evgeny, Ekaterinburg, Russia
+    //All rights reserved.
+
+    /// <inheritdoc/>
     public class CompressedMember : ICompressedMember
     {
         static readonly CompressedMemberUpdateStrategy updateStrategy = new();
+        /// <inheritdoc/>
         public bool Buckling { get; set; }
+        /// <inheritdoc/>
         public double GeometryLength { get; set; }
+        /// <inheritdoc/>
         public double LengthFactorX { get; set; }
+        /// <inheritdoc/>
         public double DiagramFactorX { get; set; }
+        /// <inheritdoc/>
         public double LengthFactorY { get; set; }
+        /// <inheritdoc/>
         public double DiagramFactorY { get; set; }
         
 
diff --git a/StructureHelperCommon/Models/Sections/ICompressedMember.cs b/StructureHelperCommon/Models/Sections/ICompressedMember.cs
index 4e399df..c1761bd 100644
--- a/StructureHelperCommon/Models/Sections/ICompressedMember.cs
+++ b/StructureHelperCommon/Models/Sections/ICompressedMember.cs
@@ -2,12 +2,31 @@
 
 namespace StructureHelperCommon.Models.Sections
 {
+
+    //Copyright (c) 2023 Redikultsev Evgeny, Ekaterinburg, Russia
+    //All rights reserved.
+
+    /// <summary>
+    /// Interface of properties for compressed strucrue members
+    /// </summary>
     public interface ICompressedMember : ICloneable
     {
+        /// <summary>
+        /// Flag of considering of buckling
+        /// </summary>
         bool Buckling { get; set; }
+        /// <summary>
+        /// Geometry length of structure member, m
+        /// </summary>
         double GeometryLength { get; set; }
-        double LengthFactorX { get; set; }
+        /// <summary>
+        /// Factor of design length in plane XOZ
+        /// </summary>
+        double LengthFactorX { get; set; }    
         double DiagramFactorX { get; set; }
+        /// <summary>
+        /// Factor of design length in plane YOZ
+        /// </summary>
         double LengthFactorY { get; set; }
         double DiagramFactorY { get; set; }
     }
diff --git a/StructureHelperCommon/Models/Sections/Logics/AccidentalEccentricityLogic.cs b/StructureHelperCommon/Models/Sections/Logics/AccidentalEccentricityLogic.cs
new file mode 100644
index 0000000..751c93e
--- /dev/null
+++ b/StructureHelperCommon/Models/Sections/Logics/AccidentalEccentricityLogic.cs
@@ -0,0 +1,85 @@
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Sections
+{
+    public class AccidentalEccentricityLogic : IAccidentalEccentricityLogic
+    {
+        private double lengthFactor;
+        private double sizeFactor;
+        private double minEccentricity;
+
+        public ICompressedMember CompressedMember { get; set; }
+        public double SizeX { get; set; }
+        public double SizeY { get; set; }
+        public IForceTuple InitialForceTuple { get; set; }
+        public IShiftTraceLogger? TraceLogger { get; set; }
+        public AccidentalEccentricityLogic()
+        {
+            lengthFactor = 1d / 600d;
+            sizeFactor = 1d / 30d;
+            minEccentricity = 0.01d;
+        }
+        public ForceTuple GetForceTuple()
+        {
+            var lengthEccetricity = CompressedMember.GeometryLength * lengthFactor;
+            TraceLogger?.AddMessage(string.Format("Accidental eccentricity by length ea = {0}", lengthEccetricity));
+            var sizeXEccetricity = SizeX * sizeFactor;
+            TraceLogger?.AddMessage(string.Format("Accidental eccentricity by SizeX = {0} ea = {1}", SizeX, sizeXEccetricity));
+            var sizeYEccetricity = SizeY * sizeFactor;
+            TraceLogger?.AddMessage(string.Format("Accidental eccentricity by SizeY = {0} ea = {1}", SizeY, sizeYEccetricity));
+            TraceLogger?.AddMessage(string.Format("Minimum accidental eccentricity ea = {0}", minEccentricity));
+            var xEccentricity = Math.Abs(InitialForceTuple.My / InitialForceTuple.Nz);
+            TraceLogger?.AddMessage(string.Format("Actual eccentricity e0,x = {0}", xEccentricity));
+            var yEccentricity = Math.Abs(InitialForceTuple.Mx / InitialForceTuple.Nz);
+            TraceLogger?.AddMessage(string.Format("Actual eccentricity e0,y = {0}", yEccentricity));
+
+            var xFullEccentricity = new List<double>()
+            {
+                lengthEccetricity,
+                sizeXEccetricity,
+                minEccentricity,
+                xEccentricity
+            }
+            .Max();
+            string mesEx = string.Format("Eccentricity e,x = max({0}; {1}; {2}; {3}) = {4}",
+                lengthEccetricity, sizeXEccetricity,
+                minEccentricity, xEccentricity,
+                xFullEccentricity);
+            TraceLogger?.AddMessage(mesEx);
+            var yFullEccentricity = new List<double>()
+            {
+                lengthEccetricity,
+                sizeYEccetricity,
+                minEccentricity,
+                yEccentricity
+            }
+            .Max();
+            string mesEy = string.Format("Eccentricity e,y = max({0}; {1}; {2}; {3}) = {4}",
+                lengthEccetricity, sizeYEccetricity,
+                minEccentricity, yEccentricity,
+                yFullEccentricity);
+            TraceLogger?.AddMessage(mesEy);
+            var mx = InitialForceTuple.Nz * yFullEccentricity * Math.Sign(InitialForceTuple.Mx);
+            var my = InitialForceTuple.Nz * xFullEccentricity * Math.Sign(InitialForceTuple.My);
+            TraceLogger?.AddMessage(string.Format("Bending moment arbitrary X-axis Mx = {0} * {1} = {2}", InitialForceTuple.Nz, yFullEccentricity, mx), TraceLogStatuses.Debug);
+            TraceLogger?.AddMessage(string.Format("Bending moment arbitrary Y-axis My = {0} * {1} = {2}", InitialForceTuple.Nz, xFullEccentricity, my), TraceLogStatuses.Debug);
+
+            var newTuple = new ForceTuple()
+            {
+                Mx = mx,
+                My = my,
+                Nz = InitialForceTuple.Nz,
+                Qx = InitialForceTuple.Qx,
+                Qy = InitialForceTuple.Qy,
+                Mz = InitialForceTuple.Mz,
+            };
+            TraceLogger?.AddEntry(new TraceTablesFactory().GetByForceTuple(newTuple));
+            return newTuple;
+        }
+    }
+}
diff --git a/StructureHelperCommon/Models/Sections/Logics/IAccidentalEccentricityLogic.cs b/StructureHelperCommon/Models/Sections/Logics/IAccidentalEccentricityLogic.cs
new file mode 100644
index 0000000..db25bbd
--- /dev/null
+++ b/StructureHelperCommon/Models/Sections/Logics/IAccidentalEccentricityLogic.cs
@@ -0,0 +1,38 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Sections
+{
+    /// <summary>
+    /// Logic for calculating of value of accidental eccentricity
+    /// </summary>
+    public interface IAccidentalEccentricityLogic : ILogic
+    {
+        /// <summary>
+        /// Properties of compressed member
+        /// </summary>
+        ICompressedMember CompressedMember {get;set;}
+        /// <summary>
+        /// Size of cross-section along X-axis, m
+        /// </summary>
+        double SizeX { get; set; }
+        /// <summary>
+        /// Size of cross-section along Y-axis, m
+        /// </summary>
+        double SizeY { get; set; }
+        /// <summary>
+        /// Initial tuple of force
+        /// </summary>
+        IForceTuple InitialForceTuple { get; set; }
+        /// <summary>
+        /// Returns new force tuple with accidental eccentricity
+        /// </summary>
+        /// <returns></returns>
+        ForceTuple GetForceTuple();
+    }
+}
diff --git a/StructureHelperLogics/Models/Templates/CrossSections/CalculatorLogic.cs b/StructureHelperLogics/Models/Templates/CrossSections/CalculatorLogic.cs
index 3884f82..c4823bd 100644
--- a/StructureHelperLogics/Models/Templates/CrossSections/CalculatorLogic.cs
+++ b/StructureHelperLogics/Models/Templates/CrossSections/CalculatorLogic.cs
@@ -1,11 +1,6 @@
-using StructureHelperCommon.Models.Calculators;
-using StructureHelperLogics.NdmCalculations.Analyses;
+using StructureHelperCommon.Models;
+using StructureHelperCommon.Models.Calculators;
 using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace StructureHelperLogics.Models.Templates.CrossSections
 {
@@ -13,8 +8,14 @@ namespace StructureHelperLogics.Models.Templates.CrossSections
     {
         public IEnumerable<ICalculator> GetNdmCalculators()
         {
-            var calculators = new List<ICalculator>();
-            calculators.Add(new ForceCalculator() { Name = "New Force Calculator"});
+            var calculators = new List<ICalculator>
+            {
+                new ForceCalculator()
+                {
+                    Name = "New Force Calculator",
+                    TraceLogger = new ShiftTraceLogger()
+                }
+            };
             return calculators;
         }
     }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs
index c3a1135..ab91116 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceCalculator.cs
@@ -16,13 +16,14 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
     public class ForceCalculator : IForceCalculator, IHasActionByResult
     {
         static readonly ForceCalculatorUpdateStrategy updateStrategy = new();
+        private readonly IForceTupleCalculator forceTupleCalculator;
         public string Name { get; set; }
-        public List<LimitStates> LimitStatesList { get; }
-        public List<CalcTerms> CalcTermsList { get; }
-        public List<IForceAction> ForceActions { get; }
-        public List<INdmPrimitive> Primitives { get; }
+        public List<LimitStates> LimitStatesList { get; private set; }
+        public List<CalcTerms> CalcTermsList { get; private set; }
+        public List<IForceAction> ForceActions { get; private set; }
+        public List<INdmPrimitive> Primitives { get; private set; }
         public IResult Result { get; private set; }
-        public ICompressedMember CompressedMember { get; }
+        public ICompressedMember CompressedMember { get; private set; }
         public IAccuracy Accuracy { get; set; }
         public List<IForceCombinationList> ForceCombinationLists { get; private set; }
         public Action<IResult> ActionToOutputResults { get; set; }
@@ -58,66 +59,129 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
                     var calcTerm = tuple.CalcTerm;
                     if (LimitStatesList.Contains(limitState) & CalcTermsList.Contains(calcTerm))
                     {
-                        var ndms = NdmPrimitivesService.GetNdms(Primitives, limitState, calcTerm);
-                        IPoint2D point2D;
-                        if (combination.SetInGravityCenter == true)
-                        {
-                            var loaderPoint = LoaderCalculator.Logics.Geometry.GeometryOperations.GetGravityCenter(ndms);
-                            point2D = new Point2D() { X = loaderPoint.Cx, Y = loaderPoint.Cy };
-                        }
-                        else point2D = combination.ForcePoint;
-                        var newTuple = ForceTupleService.MoveTupleIntoPoint(tuple.ForceTuple, point2D) as ForceTuple;
-                        IForcesTupleResult result = GetPrimitiveStrainMatrix(ndms, newTuple);
-                        if (CompressedMember.Buckling == true)
-                        {
-                            IForceTuple longTuple;
-                            if (calcTerm == CalcTerms.LongTerm)
-                            {
-                                longTuple = newTuple;
-                            }
-                            else
-                            {
-                                longTuple = GetLongTuple(combination.DesignForces, limitState);
-                            }
-                            var bucklingCalculator = GetBucklingCalculator(CompressedMember, limitState, calcTerm, newTuple, longTuple);
-                            try
-                            {
-                                bucklingCalculator.Run();
-                                var bucklingResult = bucklingCalculator.Result as IConcreteBucklingResult;
-
-                                if (bucklingResult.IsValid != true)
-                                {
-                                    result.IsValid = false;
-                                    result.Description += $"Buckling result:\n{bucklingResult.Description}\n";
-                                }
-                                newTuple = CalculateBuckling(newTuple, bucklingResult);
-                                result = GetPrimitiveStrainMatrix(ndms, newTuple);
-                            }
-                            catch (Exception ex)
-                            {
-                                result.IsValid = false;
-                                result.Description = $"Buckling error:\n{ex}\n";
-                            }
-                        }
-                        result.DesignForceTuple.LimitState = limitState;
-                        result.DesignForceTuple.CalcTerm = calcTerm;
-                        result.DesignForceTuple.ForceTuple = newTuple;
-                        ndmResult.ForcesResultList.Add(result);
-                        ActionToOutputResults?.Invoke(ndmResult);
+                        ProcessNdmResult(ndmResult, combination, tuple, limitState, calcTerm);
                     }
                 }
             }
             Result = ndmResult;
         }
 
-
-        private void GetCombinations()
+        private void ProcessNdmResult(ForcesResults ndmResult, IForceCombinationList combination, IDesignForceTuple tuple, LimitStates limitState, CalcTerms calcTerm)
         {
-            ForceCombinationLists = new List<IForceCombinationList>();
-            foreach (var item in ForceActions)
+            var ndms = NdmPrimitivesService.GetNdms(Primitives, limitState, calcTerm);
+            IPoint2D point2D;
+            if (combination.SetInGravityCenter == true)
             {
-                ForceCombinationLists.Add(item.GetCombinations());
+                var (Cx, Cy) = LoaderCalculator.Logics.Geometry.GeometryOperations.GetGravityCenter(ndms);
+                point2D = new Point2D(){ X = Cx, Y = Cy };
             }
+            else point2D = combination.ForcePoint;
+            var newTuple = ForceTupleService.MoveTupleIntoPoint(tuple.ForceTuple, point2D);
+            TraceLogger?.AddMessage($"Input force combination");
+            TraceLogger?.AddEntry(new TraceTablesFactory().GetByForceTuple(newTuple));
+            if (CompressedMember.Buckling == true)
+            {
+                if (newTuple.Nz >= 0d)
+                {
+                    TraceLogger.AddMessage(string.Format("Second order effect is not considered as Nz={0} >= 0", newTuple.Nz));
+                }
+                else
+                {
+                    newTuple = ProcessAccEccentricity(ndms, newTuple);
+                    var inputData = new BucklingInputData()
+                    {
+                        Combination = combination,
+                        LimitState = limitState,
+                        CalcTerm = calcTerm,
+                        Ndms = ndms,
+                        ForceTuple = newTuple
+                    };
+                    var bucklingResult = ProcessBuckling(inputData);
+
+                    if (bucklingResult.IsValid != true)
+                    {
+                        TraceLogger?.AddMessage(bucklingResult.Description, TraceLogStatuses.Error);
+                        var result = new ForcesTupleResult
+                        {
+                            IsValid = false,
+                            Description = $"Buckling result:\n{bucklingResult.Description}\n",
+                            DesignForceTuple = new DesignForceTuple()
+                            {
+                                ForceTuple = newTuple,
+                                LimitState = limitState,
+                                CalcTerm = calcTerm
+                            }
+                        };
+                        ndmResult.ForcesResultList.Add(result);
+                    }
+                    else
+                    {
+                        newTuple = CalculateBuckling(newTuple, bucklingResult);
+                        TraceLogger?.AddMessage($"Force combination with considering of second order effects");
+                        TraceLogger?.AddEntry(new TraceTablesFactory().GetByForceTuple(newTuple));
+
+                        var result = GetPrimitiveStrainMatrix(ndms, newTuple, Accuracy);
+                        result.DesignForceTuple.LimitState = limitState;
+                        result.DesignForceTuple.CalcTerm = calcTerm;
+                        result.DesignForceTuple.ForceTuple = newTuple;
+                        ndmResult.ForcesResultList.Add(result);
+                        ActionToOutputResults?.Invoke(ndmResult);
+                    }
+
+                }
+            }
+            else
+            {
+                if (newTuple.Nz < 0d)
+                {
+                    string message = string.Format("Second order effect is not considered, despite force Nz={0}", newTuple.Nz);
+                    TraceLogger.AddMessage(message, TraceLogStatuses.Warning);
+                }
+                var result = GetPrimitiveStrainMatrix(ndms, newTuple, Accuracy);
+                result.DesignForceTuple.LimitState = limitState;
+                result.DesignForceTuple.CalcTerm = calcTerm;
+                result.DesignForceTuple.ForceTuple = newTuple;
+                ndmResult.ForcesResultList.Add(result);
+                ActionToOutputResults?.Invoke(ndmResult);
+            }
+        }
+
+        private IForceTuple ProcessAccEccentricity(List<INdm> ndms, IForceTuple newTuple)
+        {
+            var accLogic = new AccidentalEccentricityLogic()
+            {
+                CompressedMember = CompressedMember,
+                SizeX = ndms.Max(x => x.CenterX) - ndms.Min(x => x.CenterX),
+                SizeY = ndms.Max(x => x.CenterY) - ndms.Min(x => x.CenterY),
+                InitialForceTuple = newTuple,
+            };
+            if (TraceLogger is not null) { accLogic.TraceLogger = TraceLogger.GetSimilarTraceLogger(50); }
+            newTuple = accLogic.GetForceTuple();
+            return newTuple;
+        }
+
+        private IConcreteBucklingResult ProcessBuckling(BucklingInputData inputData)
+        {
+            IForceTuple resultTuple;
+            IForceTuple longTuple;
+            if (inputData.CalcTerm == CalcTerms.LongTerm)
+            {
+                longTuple = inputData.ForceTuple;
+            }
+            else
+            {
+                longTuple = GetLongTuple(inputData.Combination.DesignForces, inputData.LimitState);
+            }
+            longTuple = ProcessAccEccentricity(inputData.Ndms, longTuple);
+            var bucklingCalculator = GetBucklingCalculator(CompressedMember, inputData.LimitState, inputData.CalcTerm, inputData.ForceTuple, longTuple);
+            if (TraceLogger is not null)
+            {
+                bucklingCalculator.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+            }
+            bucklingCalculator.Run();
+            var bucklingResult = bucklingCalculator.Result as IConcreteBucklingResult;
+          
+            return bucklingResult;
         }
 
         private IForceTuple GetLongTuple(List<IDesignForceTuple> designForces, LimitStates limitState)
@@ -136,18 +200,20 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         private IConcreteBucklingCalculator GetBucklingCalculator(ICompressedMember compressedMember, LimitStates limitStates, CalcTerms calcTerms, IForceTuple calcTuple, IForceTuple longTuple)
         {
-            IConcreteBucklingOptions options = new ConcreteBucklingOptions()
-            { CompressedMember = compressedMember,
+            var options = new ConcreteBucklingOptions()
+            { 
+                CompressedMember = compressedMember,
                 LimitState = limitStates,
                 CalcTerm = calcTerms,
                 CalcForceTuple = calcTuple,
                 LongTermTuple = longTuple,
-                Primitives = Primitives };
-            IConcreteBucklingCalculator bucklingCalculator = new ConcreteBucklingCalculator(options, Accuracy);
+                Primitives = Primitives
+            };
+            var bucklingCalculator = new ConcreteBucklingCalculator(options, Accuracy);
             return bucklingCalculator;
         }
 
-        private ForceTuple CalculateBuckling(ForceTuple calcTuple, IConcreteBucklingResult bucklingResult)
+        private ForceTuple CalculateBuckling(IForceTuple calcTuple, IConcreteBucklingResult bucklingResult)
         {
             var newTuple = calcTuple.Clone() as ForceTuple;
             newTuple.Mx *= bucklingResult.EtaFactorAlongY;
@@ -159,27 +225,86 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
         private string CheckInputData()
         {
             string result = "";
-            NdmPrimitivesService.CheckPrimitives(Primitives);
-            if (ForceActions.Count == 0) { result += "Calculator does not contain any forces \n"; }
-            if (LimitStatesList.Count == 0) { result += "Calculator does not contain any limit states \n"; }
-            if (CalcTermsList.Count == 0) { result += "Calculator does not contain any duration \n"; }
+            try
+            {
+                NdmPrimitivesService.CheckPrimitives(Primitives);
+            }
+            catch (Exception ex)
+            {
+                result += ex;
+            }
+            if (ForceActions.Count == 0)
+            {
+                result += "Calculator does not contain any forces \n";
+            }
+            if (LimitStatesList.Count == 0)
+            {
+                result += "Calculator does not contain any limit states \n";
+            }
+            if (CalcTermsList.Count == 0)
+            {
+                result += "Calculator does not contain any duration \n";
+            }
             return result;
         }
 
-        public ForceCalculator()
+        public ForceCalculator(IForceTupleCalculator forceTupleCalculator)
+        {
+            this.forceTupleCalculator = forceTupleCalculator;
+            SetDefaultProperties();
+        }
+
+        public ForceCalculator() : this(new ForceTupleCalculator())
+        {           
+        }
+
+        private void SetDefaultProperties()
         {
             ForceActions = new List<IForceAction>();
             Primitives = new List<INdmPrimitive>();
-            CompressedMember = new CompressedMember() { Buckling = false };
-            Accuracy = new Accuracy() { IterationAccuracy = 0.001d, MaxIterationCount = 1000 };
-            LimitStatesList = new List<LimitStates>() { LimitStates.ULS, LimitStates.SLS };
-            CalcTermsList = new List<CalcTerms>() { CalcTerms.ShortTerm, CalcTerms.LongTerm };
+            CompressedMember = new CompressedMember()
+            {
+                Buckling = false
+            };
+            Accuracy = new Accuracy()
+            {
+                IterationAccuracy = 0.001d,
+                MaxIterationCount = 1000
+            };
+            LimitStatesList = new List<LimitStates>()
+            {
+                LimitStates.ULS,
+                LimitStates.SLS
+            };
+            CalcTermsList = new List<CalcTerms>()
+            {
+                CalcTerms.ShortTerm,
+                CalcTerms.LongTerm
+            };
+        }
+        private void GetCombinations()
+        {
+            ForceCombinationLists = new List<IForceCombinationList>();
+            foreach (var item in ForceActions)
+            {
+                ForceCombinationLists.Add(item.GetCombinations());
+            }
         }
 
-        private IForcesTupleResult GetPrimitiveStrainMatrix(IEnumerable<INdm> ndmCollection, IForceTuple tuple)
+        private IForcesTupleResult GetPrimitiveStrainMatrix(IEnumerable<INdm> ndmCollection, IForceTuple tuple, IAccuracy accuracy)
         {
-            IForceTupleInputData inputData = new ForceTupleInputData() { NdmCollection = ndmCollection, Tuple = tuple, Accuracy = Accuracy };
-            IForceTupleCalculator calculator = new ForceTupleCalculator(inputData);
+            var inputData = new ForceTupleInputData()
+            {
+                NdmCollection = ndmCollection,
+                Tuple = tuple,
+                Accuracy = accuracy
+            };
+            var calculator = forceTupleCalculator.Clone() as IForceTupleCalculator;
+            calculator.InputData = inputData;
+            if (TraceLogger is not null)
+            {
+                calculator.TraceLogger = TraceLogger.GetSimilarTraceLogger();
+            }
             calculator.Run();
             return calculator.Result as IForcesTupleResult;
         }
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs
index 94cf87d..3408614 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/ForceTupleCalculator.cs
@@ -4,6 +4,7 @@ using LoaderCalculator.Data.ResultData;
 using LoaderCalculator.Data.SourceData;
 using StructureHelperCommon.Models;
 using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Loggers;
 
 namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 {
@@ -74,7 +75,7 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
                     return new ForcesTupleResult()
                     {
                         IsValid = true,
-                        Description = "Analysis is done succsefully",
+                        Description = LoggerStrings.CalculationHasDone,
                         LoaderResults = calcResult
                     };
                 }
@@ -113,7 +114,8 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
 
         public object Clone()
         {
-            throw new NotImplementedException();
+            var newItem = new ForceTupleCalculator();
+            return newItem;
         }
 
         private static void ShowResultToConsole(ILoaderResults result)
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleInputData.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleInputData.cs
new file mode 100644
index 0000000..34b5cce
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleInputData.cs
@@ -0,0 +1,22 @@
+using LoaderCalculator.Data.Ndms;
+using StructureHelperCommon.Infrastructures.Enums;
+using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
+{
+    public interface IProcessTupleInputData : IInputData
+    {
+        List<INdm> Ndms { get; set; }
+        IForceCombinationList Combination { get; set; }
+        IDesignForceTuple Tuple { get; set; }
+        LimitStates LimitState { get; set; }
+        CalcTerms CalcTerm { get; set; }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs
new file mode 100644
index 0000000..3000ee5
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/IProcessTupleLogic.cs
@@ -0,0 +1,15 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
+{
+    public interface IProcessTupleLogic : ILogic
+    {
+        IForceTupleInputData InputData { get; set; }
+        IForcesTupleResult ProcessNdmResult();
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs
new file mode 100644
index 0000000..979c71a
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Analyses/ByForces/Logics/ProcessTupleLogic.cs
@@ -0,0 +1,20 @@
+using StructureHelperCommon.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.ByForces
+{
+    public class ProcessTupleLogic : IProcessTupleLogic
+    {
+        public IShiftTraceLogger? TraceLogger { get; set; }
+        IForceTupleInputData IProcessTupleLogic.InputData { get; set; }
+
+        public IForcesTupleResult ProcessNdmResult()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/BucklingInputData.cs b/StructureHelperLogics/NdmCalculations/Buckling/BucklingInputData.cs
new file mode 100644
index 0000000..bba3812
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Buckling/BucklingInputData.cs
@@ -0,0 +1,21 @@
+using LoaderCalculator.Data.Ndms;
+using StructureHelperCommon.Infrastructures.Enums;
+using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Buckling
+{
+    public class BucklingInputData : IInputData
+    {
+        public IForceCombinationList Combination { get; set; }
+        public LimitStates LimitState { get; set; }
+        public CalcTerms CalcTerm { get; set; }
+        public List<INdm> Ndms { get; set; }
+        public IForceTuple ForceTuple { get; set; }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs b/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs
index 96fafe5..82faa26 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/ConcreteBucklingCalculator.cs
@@ -4,6 +4,7 @@ using LoaderCalculator.Logics.Geometry;
 using StructureHelperCommon.Models;
 using StructureHelperCommon.Models.Calculators;
 using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Loggers;
 using StructureHelperCommon.Models.Shapes;
 using StructureHelperLogics.Models.Materials;
 using StructureHelperLogics.NdmCalculations.Analyses.ByForces;
@@ -28,16 +29,16 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 
         public IAccuracy Accuracy { get; set; }
         public Action<IResult> ActionToOutputResults { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
-        public IShiftTraceLogger? TraceLogger { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
+        public IShiftTraceLogger? TraceLogger { get; set; }
 
         private (double EtaAlongX, double EtaAlongY) GetBucklingCoefficients()
         {
-            var stiffness = GetStiffness();
+            var (DX, DY) = GetStiffness();
             criticalForceLogic.LongitudinalForce = options.CalcForceTuple.Nz;
-            criticalForceLogic.StiffnessEI = stiffness.DX;
+            criticalForceLogic.StiffnessEI = DX;
             criticalForceLogic.DesignLength = options.CompressedMember.GeometryLength * options.CompressedMember.LengthFactorY;
             var etaAlongY = criticalForceLogic.GetEtaFactor();
-            criticalForceLogic.StiffnessEI = stiffness.DY;
+            criticalForceLogic.StiffnessEI = DY;
             criticalForceLogic.DesignLength = options.CompressedMember.GeometryLength * options.CompressedMember.LengthFactorX;
             var etaAlongX = criticalForceLogic.GetEtaFactor();
             return (etaAlongX, etaAlongY);
@@ -59,13 +60,21 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
         private (IConcreteDeltaELogic DeltaLogicX, IConcreteDeltaELogic DeltaLogicY) GetDeltaLogics()
         {
             IForceTuple forceTuple = options.CalcForceTuple;
-            if (forceTuple.Nz >= 0) { return (new ConstDeltaELogic(), new ConstDeltaELogic()); }
+            if (forceTuple.Nz >= 0)
+            {
+                return (new ConstDeltaELogic(), new ConstDeltaELogic());
+            }
             var eccentricityAlongX = options.CalcForceTuple.My / forceTuple.Nz;
             var eccentricityAlongY = options.CalcForceTuple.Mx / forceTuple.Nz;
             var sizeAlongX = ndmCollection.Max(x => x.CenterX) - ndmCollection.Min(x => x.CenterX);
             var sizeAlongY = ndmCollection.Max(x => x.CenterY) - ndmCollection.Min(x => x.CenterY);
             var DeltaElogicAboutX = new DeltaELogicSP63(eccentricityAlongY, sizeAlongY);
             var DeltaElogicAboutY = new DeltaELogicSP63(eccentricityAlongX, sizeAlongX);
+            if (TraceLogger is not null)
+            {
+                DeltaElogicAboutX.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+                DeltaElogicAboutY.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+            }
             return (DeltaElogicAboutX, DeltaElogicAboutY);
         }
 
@@ -78,16 +87,26 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
         private (double DX, double DY) GetStiffness()
         {
             var gravityCenter = GeometryOperations.GetGravityCenter(ndmCollection);
-
-            var concreteInertia = GeometryOperations.GetReducedMomentsOfInertia(concreteNdms, gravityCenter);
+            string message = string.Format("Gravity center, x = {0}, y = {1}", gravityCenter.Cx, gravityCenter.Cy);
+            TraceLogger?.AddMessage(message);
+            var (EIx, EIy) = GeometryOperations.GetReducedMomentsOfInertia(concreteNdms, gravityCenter);
+            TraceLogger.AddMessage(string.Format("Summary stiffness of concrete parts EIx,c = {0}", EIx));
+            TraceLogger.AddMessage(string.Format("Summary stiffness of concrete parts EIy,c = {0}", EIy));
             var otherInertia = GeometryOperations.GetReducedMomentsOfInertia(otherNdms, gravityCenter);
+            TraceLogger.AddMessage(string.Format("Summary stiffness of nonconcrete parts EIx,s = {0}", otherInertia.EIy));
+            TraceLogger.AddMessage(string.Format("Summary stiffness of nonconcrete parts EIy,s = {0}", otherInertia.EIy));
 
-            var stiffnessX = stiffnessLogicX.GetStiffnessCoeffitients();
-            var dX = stiffnessX.Kc * concreteInertia.EIx  + stiffnessX.Ks * otherInertia.EIx;
+            var (Kc, Ks) = stiffnessLogicX.GetStiffnessCoeffitients();
+            var dX = Kc * EIx  + Ks * otherInertia.EIx;
+            string mesDx = string.Format("Summary stiffness Dx = Kc * EIx,c + Ks * EIx,s = {0} * {1} + {2} * {3} = {4}",
+                Kc, EIx, Ks, otherInertia.EIx, dX);
+            TraceLogger.AddMessage(mesDx);
 
             var stiffnessY = stiffnessLogicY.GetStiffnessCoeffitients();
-            var dY = stiffnessY.Kc * concreteInertia.EIy + stiffnessY.Ks * otherInertia.EIy;
-
+            var dY = stiffnessY.Kc * EIy + stiffnessY.Ks * otherInertia.EIy;
+            string mesDy = string.Format("Summary stiffness Dy = Kc * EIy,c + Ks * EIy,s = {0} * {1} + {2} * {3} = {4}",
+                stiffnessY.Kc, EIy, stiffnessY.Ks, otherInertia.EIy, dY);
+            TraceLogger.AddMessage(mesDy);
             return (dX, dY);
         }
 
@@ -113,34 +132,63 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
                     point = new Point2D() { X = item.CenterX, Y = item.CenterY };
                 }
             }
+            TraceLogger.AddMessage(string.Format("Most tensioned (minimum compressed) point: x = {0}, y = {1}", point.X, point.Y));
+            TraceLogger.AddMessage(string.Format("Strain: epsilon = {0}", maxStrain), TraceLogStatuses.Debug);
             return point;
         }
 
         private IForceTupleCalculator GetForceCalculator()
         {
             var tuple = options.CalcForceTuple;
-            IForceTupleInputData inputData = new ForceTupleInputData() { NdmCollection = ndmCollection, Tuple = tuple, Accuracy = Accuracy };
+            IForceTupleInputData inputData = new ForceTupleInputData()
+            {
+                NdmCollection = ndmCollection,
+                Tuple = tuple, Accuracy = Accuracy
+            };
             IForceTupleCalculator calculator = new ForceTupleCalculator(inputData);
             return calculator;
         }
 
         public void Run()
         {
+            TraceLogger?.AddMessage(LoggerStrings.CalculatorType(this), TraceLogStatuses.Service);
+            TraceLogger?.AddMessage(LoggerStrings.MethodBasedOn + "SP63.13330.2018");
             var checkResult = CheckInputData();
             if (checkResult != "")
             {
-                Result = new ConcreteBucklingResult() { IsValid = false, Description = checkResult };
+                TraceLogger?.AddMessage(checkResult, TraceLogStatuses.Error);
+                Result = new ConcreteBucklingResult()
+                {
+                    IsValid = false,
+                    Description = checkResult,
+                    EtaFactorAlongX = double.PositiveInfinity,
+                    EtaFactorAlongY = double.PositiveInfinity
+                };
                 return;
             }
             else
             {
-                IConcretePhiLLogic phiLLogic = GetPhiLogic();
+                var phiLLogic = GetPhiLogic();
                 var (DeltaLogicAboutX, DeltaLogicAboutY) = GetDeltaLogics();
                 stiffnessLogicX = new RCStiffnessLogicSP63(phiLLogic, DeltaLogicAboutX);
                 stiffnessLogicY = new RCStiffnessLogicSP63(phiLLogic, DeltaLogicAboutY);
+                if (TraceLogger is not null)
+                {
+                    stiffnessLogicX.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+                    stiffnessLogicY.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+                }
                 criticalForceLogic = new EilerCriticalForceLogic();
+                if (TraceLogger is not null)
+                {
+                    criticalForceLogic.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+                }
 
                 var (EtaFactorX, EtaFactorY) = GetBucklingCoefficients();
+                var messageString = "Eta factor orbitrary {0} axis, Etta{0} = {1} (dimensionless)";
+                var messageStringX = string.Format(messageString, "X", EtaFactorX);
+                var messageStringY = string.Format(messageString, "Y", EtaFactorY);
+                TraceLogger?.AddMessage(messageStringX);
+                TraceLogger?.AddMessage(messageStringY);
                 Result = new ConcreteBucklingResult()
                 {
                     IsValid = true,
@@ -148,17 +196,26 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
                     EtaFactorAlongY = EtaFactorY
                 };
             }
+            TraceLogger?.AddMessage(LoggerStrings.CalculationHasDone);
         }
 
         private string CheckInputData()
         {
             string result = "";
+            var tuple = options.CalcForceTuple;
+            if (tuple.Nz >= 0d)
+            {
+                result += $"Force Nz = {tuple.Nz} must negative in compression";
+                return result;
+            }
             IForceTupleCalculator calculator = GetForceCalculator();
             calculator.Run();
             forcesResults = calculator.Result as IForcesTupleResult;
             if (forcesResults.IsValid != true)
             {
-                result += "Bearind capacity of crosssection is not enough for initial forces\n";
+                result += "Bearind capacity of cross-section is not enough for initial forces\n";
+                TraceLogger?.AddMessage("Initial forces", TraceLogStatuses.Error);
+                TraceLogger?.AddEntry(new TraceTablesFactory().GetByForceTuple(tuple));
             }
             return result;
         }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/ConstDeltaELogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/ConstDeltaELogic.cs
index ed60dd4..8e8daec 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/ConstDeltaELogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/ConstDeltaELogic.cs
@@ -1,4 +1,6 @@
-using System;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -8,9 +10,15 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 {
     public class ConstDeltaELogic : IConcreteDeltaELogic
     {
+        private const double deltaE = 1.5d;
+
+        public IShiftTraceLogger? TraceLogger { get; set; }
+
         public double GetDeltaE()
         {
-            return 1.5d;
+            var message = string.Format("Simple method of calculatinf of effect of eccentricity, DeltaE = {0}, dimensionless", deltaE);
+            TraceLogger?.AddMessage(message);
+            return deltaE;
         }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/ConstPhiLLogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/ConstPhiLLogic.cs
index a9cdc03..add8f57 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/ConstPhiLLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/ConstPhiLLogic.cs
@@ -1,4 +1,5 @@
-using System;
+using StructureHelperCommon.Models;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -8,9 +9,15 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 {
     internal class ConstPhiLLogic : IConcretePhiLLogic
     {
+        private const double phiL = 2.0d;
+
+        public IShiftTraceLogger? TraceLogger { get; set; }
+
         public double GetPhil()
         {
-            return 2.0d;
+            var message = string.Format("Simple method of calculatinf of effect of long term load, PhiL = {0}, dimensionless", phiL);
+            TraceLogger?.AddMessage(message);
+            return phiL;
         }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/CriticalForceSP63Logic.cs b/StructureHelperLogics/NdmCalculations/Buckling/CriticalForceSP63Logic.cs
index 6d14887..c25db39 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/CriticalForceSP63Logic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/CriticalForceSP63Logic.cs
@@ -1,4 +1,5 @@
-using System;
+using StructureHelperCommon.Models;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -10,6 +11,8 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
     {
         double concreteFactor, reinforcementFactor;
 
+        public IShiftTraceLogger? TraceLogger { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
+
         public double GetCriticalForce()
         {
             throw new NotImplementedException();
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/DeltaELogicSP63.cs b/StructureHelperLogics/NdmCalculations/Buckling/DeltaELogicSP63.cs
index 325a601..3f5b8fb 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/DeltaELogicSP63.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/DeltaELogicSP63.cs
@@ -1,4 +1,6 @@
 using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Models;
+using StructureHelperCommon.Models.Loggers;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -14,21 +16,31 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 
         readonly double eccentricity;
         readonly double size;
+        public IShiftTraceLogger? TraceLogger { get; set; }
         public DeltaELogicSP63(double eccentricity, double size)
         {
             if (size <= 0 )
             {
+                TraceLogger?.AddMessage(string.Format("Height of cross-section is less or equal to zero, h = {0}", size));
                 throw new StructureHelperException(ErrorStrings.SizeMustBeGreaterThanZero + $", actual size: {size}");
             }
             this.eccentricity = eccentricity;
             this.size = size;
         }
 
+
         public double GetDeltaE()
         {
+            TraceLogger?.AddMessage(LoggerStrings.CalculatorType(this), TraceLogStatuses.Service);
+            TraceLogger?.AddMessage(string.Format("Eccentricity e = {0}", eccentricity));
+            TraceLogger?.AddMessage(string.Format("Height h = {0}", size));
             var deltaE = Math.Abs(eccentricity) / size;
+            string message = string.Format("Relative eccentricity DeltaE = eccentricity / height = {0} / {1} = {2} (dimensionless)", eccentricity, size, deltaE);
+            TraceLogger?.AddMessage(message);
             deltaE = Math.Max(deltaE, deltaEMin);
             deltaE = Math.Min(deltaE, deltaEMax);
+            TraceLogger?.AddMessage(string.Format("But not less than {0}, and not greater than {1}", deltaEMin, deltaEMax));
+            TraceLogger?.AddMessage(string.Format("Relative eccentricity DeltaE = {0}", deltaE));
             return deltaE;
         }
     }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/EilerCriticalForceLogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/EilerCriticalForceLogic.cs
index e2705a9..1520fd3 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/EilerCriticalForceLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/EilerCriticalForceLogic.cs
@@ -1,4 +1,6 @@
 using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Models;
+using StructureHelperCommon.Models.Loggers;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -12,22 +14,30 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
         public double LongitudinalForce { get; set; }
         public double StiffnessEI { get; set; }
         public double DesignLength { get; set; }
+        public IShiftTraceLogger? TraceLogger { get; set; }
 
         public double GetCriticalForce()
         {
-            double Ncr = - Math.Pow(Math.PI, 2) * StiffnessEI / (Math.Pow(DesignLength, 2));
+            double Ncr = - Math.Pow(Math.PI, 2) * StiffnessEI / Math.Pow(DesignLength, 2);
+            string message = string.Format("Ncr = - (PI ^ 2) * D / L0 ^2 = - ({0} * {1} / ({2} ^2)) = {3}, N", Math.PI, StiffnessEI, DesignLength, Ncr);
+            TraceLogger?.AddMessage(message);
             return Ncr;
         }
 
         public double GetEtaFactor()
         {
+            TraceLogger?.AddMessage(LoggerStrings.CalculatorType(this), TraceLogStatuses.Service);
             if (LongitudinalForce >= 0d) return 1d;
             var Ncr = GetCriticalForce();
             if (LongitudinalForce <= Ncr)
             {
+                string error = string.Format("Absolute value of longitudinalForce is greater or equal than critical force N = {0} => Ncr = {1}", Math.Abs(LongitudinalForce), Ncr);
+                TraceLogger?.AddMessage(error, TraceLogStatuses.Error);
                 throw new StructureHelperException(ErrorStrings.LongitudinalForceMustBeLessThanCriticalForce);
             }
             double eta = 1 / (1 - LongitudinalForce / Ncr);
+            string message = string.Format("Eta factor Eta = 1 / (1 - N / Ncr) = 1 / (1 - {0} / {1}) = {2}, {3}", (-1) * LongitudinalForce, (-1) * Ncr, eta, LoggerStrings.DimensionLess);
+            TraceLogger?.AddMessage(message);
             return eta;
         }
     }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/IConcreteDeltaELogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/IConcreteDeltaELogic.cs
index 5654179..5aa7187 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/IConcreteDeltaELogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/IConcreteDeltaELogic.cs
@@ -1,4 +1,5 @@
-using System;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -6,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Buckling
 {
-    internal interface IConcreteDeltaELogic
+    internal interface IConcreteDeltaELogic : ILogic
     {
         double GetDeltaE();
     }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/IConcretePhiLLogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/IConcretePhiLLogic.cs
index 504e935..42e028c 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/IConcretePhiLLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/IConcretePhiLLogic.cs
@@ -1,4 +1,5 @@
-using System;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -6,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Buckling
 {
-    public interface IConcretePhiLLogic
+    public interface IConcretePhiLLogic : ILogic
     {
         double GetPhil();
     }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/ICriticalBucklingForceLogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/ICriticalBucklingForceLogic.cs
index 1d14189..d223dda 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/ICriticalBucklingForceLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/ICriticalBucklingForceLogic.cs
@@ -1,4 +1,5 @@
-using System;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -6,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Buckling
 {
-    internal interface ICriticalBucklingForceLogic
+    internal interface ICriticalBucklingForceLogic : ILogic
     {
         double GetCriticalForce();
         double GetEtaFactor();
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/IRCStiffnessLogic.cs b/StructureHelperLogics/NdmCalculations/Buckling/IRCStiffnessLogic.cs
index 39cee43..94d2f63 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/IRCStiffnessLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/IRCStiffnessLogic.cs
@@ -1,4 +1,5 @@
-using StructureHelperLogics.NdmCalculations.Primitives;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperLogics.NdmCalculations.Primitives;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -7,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Buckling
 {
-    public interface IRCStiffnessLogic
+    public interface IRCStiffnessLogic : ILogic
     {
         (double Kc, double Ks) GetStiffnessCoeffitients();
     }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/PhiLogicSP63.cs b/StructureHelperLogics/NdmCalculations/Buckling/PhiLogicSP63.cs
index cb02ffd..fa7b072 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/PhiLogicSP63.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/PhiLogicSP63.cs
@@ -1,4 +1,6 @@
-using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Loggers;
 using StructureHelperCommon.Models.Shapes;
 using StructureHelperCommon.Services.Forces;
 using System;
@@ -11,6 +13,8 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 {
     public class PhiLogicSP63 : IConcretePhiLLogic
     {
+        private const double maxValueOfPhiL = 2d;
+        private const double minValueOfPhiL = 1d;
         readonly IForceTuple fullForceTuple;
         readonly IForceTuple longForceTuple;
         readonly IPoint2D point;
@@ -21,21 +25,43 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
             this.point = point;
         }
 
+        public IShiftTraceLogger? TraceLogger { get; set; }
+
         public double GetPhil()
         {
+            TraceLogger?.AddMessage(LoggerStrings.CalculatorType(this), TraceLogStatuses.Service);
             var distance = Math.Sqrt(point.X * point.X + point.Y * point.Y);
+            string distMessage = string.Format("Distance = Sqrt(dX ^2 + dY^2) = Sqrt(({0})^2 + ({1})^2) = {2}, m", point.X, point.Y, distance);
+            TraceLogger?.AddMessage(distMessage);
             var fullMoment = GetMoment(fullForceTuple, distance);
+            string fullMomentMessage = string.Format("FullMoment = {0}, N*m", fullMoment);
+            TraceLogger?.AddMessage(fullMomentMessage);
             var longMoment = GetMoment(longForceTuple, distance);
-            if (fullMoment == 0d) { return 2d; }
-            var phi = 1 + longMoment / fullMoment;
-            phi = Math.Max(1, phi);
-            phi = Math.Min(2, phi);
-            return phi;
+            string longMomentMessage = string.Format("LongMoment = {0}, N*m", longMoment);
+            TraceLogger?.AddMessage(longMomentMessage);
+            if (fullMoment == 0d)
+            {
+                return maxValueOfPhiL;
+            }
+            var phiL = 1 + longMoment / fullMoment;
+            string phiLMessage = string.Format("PhiL = 1 + LongMoment / FullMoment = 1+ {0} / {1} = {2}, (dimensionless)", longMoment, fullMoment, phiL);
+            TraceLogger?.AddMessage(phiLMessage);
+            TraceLogger?.AddMessage(string.Format("But not less than {0}, and not greater than {1}", minValueOfPhiL, maxValueOfPhiL));
+            phiL = Math.Max(minValueOfPhiL, phiL);
+            phiL = Math.Min(maxValueOfPhiL, phiL);
+            TraceLogger?.AddMessage(string.Format("PhiL =  {0}, (dimensionless)", phiL));
+            return phiL;
         }
 
         private double GetMoment(IForceTuple forceTuple, double distance)
         {
-            return Math.Abs(forceTuple.Nz) * distance + Math.Abs(forceTuple.Mx) + Math.Abs(forceTuple.My);
+            double nz = Math.Abs(forceTuple.Nz);
+            double mx = Math.Abs(forceTuple.Mx);
+            double my = Math.Abs(forceTuple.My);
+            double moment = nz * distance + mx + my;
+            string message = string.Format("Moment = Nz * distance + Abs(Mx) + Abs(My) = {0} * {1} + {2} + {3} = {4}, N *m", nz, distance, mx, my, moment);
+            TraceLogger?.AddMessage(message);
+            return moment;
         }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Buckling/RCStiffnessLogicSP63.cs b/StructureHelperLogics/NdmCalculations/Buckling/RCStiffnessLogicSP63.cs
index 357a14b..54d9fa2 100644
--- a/StructureHelperLogics/NdmCalculations/Buckling/RCStiffnessLogicSP63.cs
+++ b/StructureHelperLogics/NdmCalculations/Buckling/RCStiffnessLogicSP63.cs
@@ -1,4 +1,6 @@
-using System;
+using StructureHelperCommon.Models;
+using StructureHelperCommon.Models.Loggers;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -8,8 +10,13 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 {
     internal class RCStiffnessLogicSP63 : IRCStiffnessLogic
     {
+        const double initialKs = 0.7d;
+        const double initialKc = 0.15d;
+        const double deltaEAddition = 0.3d;
+
         IConcretePhiLLogic phiLLogic { get; }
         IConcreteDeltaELogic deltaELogic { get; }
+        public IShiftTraceLogger? TraceLogger { get; set; }
 
         public RCStiffnessLogicSP63() : this(new ConstPhiLLogic(), new ConstDeltaELogic()) { }
 
@@ -21,12 +28,17 @@ namespace StructureHelperLogics.NdmCalculations.Buckling
 
         public (double Kc, double Ks) GetStiffnessCoeffitients()
         {
-            const double initialKs = 0.7d;
-            const double initialKc = 0.15d;
-            const double deltaEAddition = 0.3d;
+            if (TraceLogger is not null)
+            {
+                phiLLogic.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+                deltaELogic.TraceLogger = TraceLogger.GetSimilarTraceLogger(50);
+            }
             double phiL = phiLLogic.GetPhil();
             double deltaE = deltaELogic.GetDeltaE();
+            TraceLogger?.AddMessage(string.Format("Factor of relative eccentricity DeltaE = {0}", deltaE));
             double kc = initialKc / (phiL * (deltaEAddition + deltaE));
+            var messageString = string.Format("Factor of stiffness of concrete Kc = {0} / ({1} * ({2} + {3}))  = {4}, {5}", initialKc, phiL, deltaEAddition, deltaE, kc, LoggerStrings.DimensionLess);
+            TraceLogger?.AddMessage(messageString);
             return (kc, initialKs);
         }
     }
diff --git a/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs b/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs
index f1eaf60..709bdee 100644
--- a/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs
+++ b/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs
@@ -34,8 +34,14 @@ namespace StructureHelperLogics.Services.NdmPrimitives
 
         public static bool CheckPrimitives(IEnumerable<INdmPrimitive> primitives)
         {
-            if (primitives.Count() == 0) { throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $": Count of primitive must be greater than zero"); }
-            if (primitives.Count(x => x.Triangulate == true) == 0) { throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $": There are not primitives to triangulate"); }
+            if (!primitives.Any())
+            {
+                throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $": Count of primitive must be greater than zero");
+            }
+            if (!primitives.Any(x => x.Triangulate == true))
+            {
+                throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $": There are not primitives to triangulate");
+            }
             foreach (var item in primitives)
             {
                 if (item.Triangulate == true &