diff --git a/DataAccess/DTOs/CirclePrimitiveDTO.cs b/DataAccess/DTOs/CirclePrimitiveDTO.cs
new file mode 100644
index 0000000..8df3566
--- /dev/null
+++ b/DataAccess/DTOs/CirclePrimitiveDTO.cs
@@ -0,0 +1,13 @@
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataAccess.DTOs
+{
+    public class CirclePrimitiveDTO
+    {
+    }
+}
diff --git a/DataAccess/DTOs/NdmPrimitiveDTO.cs b/DataAccess/DTOs/NdmPrimitiveDTO.cs
new file mode 100644
index 0000000..e24b87c
--- /dev/null
+++ b/DataAccess/DTOs/NdmPrimitiveDTO.cs
@@ -0,0 +1,35 @@
+using Newtonsoft.Json;
+using StructureHelper.Models.Materials;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataAccess.DTOs
+{
+    public class NdmPrimitiveDTO : INdmElement
+    {
+        [JsonProperty("Id")]
+        public Guid Id { get; set; }
+        [JsonProperty("Center")]
+        public IPoint2D Center { get; set; }
+        [JsonProperty("HeadMaterial")]
+        public IHeadMaterial? HeadMaterial { get; set; }
+        [JsonProperty("Triangulate")]
+        public bool Triangulate { get; set; }
+        [JsonProperty("UserPrestrain")]
+        public StrainTuple UsersPrestrain { get; } = new StrainTuple();
+        [JsonIgnore]
+        public StrainTuple AutoPrestrain => throw new NotImplementedException();
+
+
+        public object Clone()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs b/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs
index 650e7db..75f00ab 100644
--- a/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs
+++ b/StructureHelperCommon/Models/Forces/Logics/ForceTupleUpdateStrategy.cs
@@ -13,8 +13,8 @@ namespace StructureHelperCommon.Models.Forces
     {
         public void Update(IForceTuple targetObject, IForceTuple sourceObject)
         {
+            CheckObject.IsNull(targetObject, sourceObject);
             if (ReferenceEquals(targetObject, sourceObject)) { return; }
-            CheckObject.CompareTypes(targetObject, sourceObject);
 
             targetObject.Mx = sourceObject.Mx;
             targetObject.My = sourceObject.My;
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs
index 2275ee7..f525154 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs
@@ -28,7 +28,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
         public bool ClearUnderlying { get; set; }
         public bool Triangulate { get; set; }
         public ICrossSection? CrossSection { get; set; }
-
+        public INdmElement NdmElement { get; } = new NdmElement();
 
         public CirclePrimitive(Guid id)
         {
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/INdmElement.cs b/StructureHelperLogics/NdmCalculations/Primitives/INdmElement.cs
new file mode 100644
index 0000000..e600468
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Primitives/INdmElement.cs
@@ -0,0 +1,37 @@
+using StructureHelper.Models.Materials;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperLogics.Models.CrossSections;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Primitives
+{
+    public interface INdmElement : ISaveable, ICloneable
+    {
+        /// <summary>
+        /// Base point of primitive
+        /// </summary>
+        IPoint2D Center { get; }
+        /// <summary>
+        /// Material of primitive
+        /// </summary>
+        IHeadMaterial? HeadMaterial { get; set; }
+        /// <summary>
+        /// Flag of triangulation
+        /// </summary>
+        bool Triangulate { get; set; }
+        /// <summary>
+        /// Prestrain assigned from user
+        /// </summary>
+        StrainTuple UsersPrestrain { get; }
+        /// <summary>
+        /// Prestrain assigned from calculations
+        /// </summary>
+        StrainTuple AutoPrestrain { get; }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs
index e3621b3..c46eefc 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs
@@ -23,6 +23,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
         /// Name of primitive
         /// </summary>
         string? Name { get; set; }
+        INdmElement NdmElement { get;}
         /// <summary>
         /// Base point of primitive
         /// </summary>
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/Logics/BaseUpdateStrategy.cs b/StructureHelperLogics/NdmCalculations/Primitives/Logics/BaseUpdateStrategy.cs
index b593b2c..b014d29 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/Logics/BaseUpdateStrategy.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/Logics/BaseUpdateStrategy.cs
@@ -2,6 +2,7 @@
 using StructureHelperCommon.Models.Forces;
 using StructureHelperCommon.Models.Shapes;
 using StructureHelperCommon.Models.Shapes.Logics;
+using StructureHelperCommon.Services;
 using StructureHelperCommon.Services.Forces;
 using System;
 using System.Collections.Generic;
@@ -19,6 +20,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
 
         public void Update(INdmPrimitive targetObject, INdmPrimitive sourceObject)
         {
+            CheckObject.IsNull(targetObject, sourceObject);
             if (ReferenceEquals(targetObject, sourceObject)) { return; }
             targetObject.Name = sourceObject.Name;
             if (sourceObject.HeadMaterial != null) targetObject.HeadMaterial = sourceObject.HeadMaterial;
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/Logics/INdmElementUpdateStrategy.cs b/StructureHelperLogics/NdmCalculations/Primitives/Logics/INdmElementUpdateStrategy.cs
new file mode 100644
index 0000000..a160117
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Primitives/Logics/INdmElementUpdateStrategy.cs
@@ -0,0 +1,42 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperCommon.Services;
+
+namespace StructureHelperLogics.NdmCalculations.Primitives.Logics
+{
+    public class INdmElementUpdateStrategy : IUpdateStrategy<INdmElement>
+    {
+        private readonly IUpdateStrategy<IPoint2D> point2DUpdateStrategy;
+        private readonly IUpdateStrategy<IForceTuple> tupleUpdateStrategy;
+
+        public INdmElementUpdateStrategy(IUpdateStrategy<IPoint2D> point2DUpdateStrategy,
+            IUpdateStrategy<IForceTuple> tupleUpdateStrategy)
+        {
+            this.point2DUpdateStrategy = point2DUpdateStrategy;
+            this.tupleUpdateStrategy = tupleUpdateStrategy;
+        }
+
+        public INdmElementUpdateStrategy() : this (
+            new Point2DUpdateStrategy(),
+            new ForceTupleUpdateStrategy())
+        {
+            
+        }
+
+        /// <inheritdoc/>
+        public void Update(INdmElement targetObject, INdmElement sourceObject)
+        {
+            CheckObject.IsNull(targetObject, sourceObject);
+            if (ReferenceEquals(targetObject, sourceObject)) { return; }
+
+            point2DUpdateStrategy.Update(targetObject.Center, sourceObject.Center);
+            if (sourceObject.HeadMaterial != null)
+            {
+                targetObject.HeadMaterial = sourceObject.HeadMaterial;
+            }
+            targetObject.Triangulate = sourceObject.Triangulate;
+            tupleUpdateStrategy.Update(targetObject.UsersPrestrain, sourceObject.UsersPrestrain);
+        }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/NdmElement.cs b/StructureHelperLogics/NdmCalculations/Primitives/NdmElement.cs
new file mode 100644
index 0000000..60851f3
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Primitives/NdmElement.cs
@@ -0,0 +1,47 @@
+using StructureHelper.Models.Materials;
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperLogics.Models.CrossSections;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Primitives
+{
+    /// <inheritdoc/>
+    public class NdmElement : INdmElement
+    {
+        private IUpdateStrategy<INdmElement> updateStrategy;
+        /// <inheritdoc/>
+        public Guid Id { get; }
+        /// <inheritdoc/>
+        public IPoint2D Center { get; } = new Point2D();
+        /// <inheritdoc/>
+        public IHeadMaterial? HeadMaterial { get; set; }
+        /// <inheritdoc/>
+        public bool Triangulate { get; set; }
+        /// <inheritdoc/>
+        public StrainTuple UsersPrestrain { get; } = new();
+        /// <inheritdoc/>
+        public StrainTuple AutoPrestrain { get; } = new();
+
+        public NdmElement(Guid id)
+        {
+            Id = id;
+        }
+
+        public NdmElement() : this(Guid.NewGuid())
+        {
+            
+        }
+
+        /// <inheritdoc/>
+        public object Clone()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/PointPrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/PointPrimitive.cs
index 5540e02..cdf395a 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/PointPrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/PointPrimitive.cs
@@ -26,6 +26,7 @@ namespace StructureHelperLogics.Models.Primitives
         public bool Triangulate { get; set; }
         public ICrossSection? CrossSection { get; set; }
 
+        public INdmElement NdmElement { get; } = new NdmElement();
 
         public PointPrimitive(Guid id)
         {
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/RebarPrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/RebarPrimitive.cs
index 97d3c75..a0a1787 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/RebarPrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/RebarPrimitive.cs
@@ -47,6 +47,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
         /// <inheritdoc/>
         public ICrossSection? CrossSection { get; set; }
 
+        public INdmElement NdmElement { get; } = new NdmElement();
 
         public RebarPrimitive(Guid id)
         {
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs
index 6007b60..0537b4b 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs
@@ -29,6 +29,8 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
 
         public IPoint2D Center { get; private set; }
 
+        public INdmElement NdmElement { get; } = new NdmElement();
+
         public RectanglePrimitive(Guid id)
         {
             Id = id;