diff --git a/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IDiy.cs b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IDiy.cs
new file mode 100644
index 0000000..6e96e88
--- /dev/null
+++ b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IDiy.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IDiy : IId
+    {
+        string Title { get; }
+        string Description { get; }
+        string TaskName { get; }
+        DateTime DateCreate { get; }
+        int TaskId { get; }
+        int StudentId { get; }
+        Dictionary<int, IInterest> DiyInterests { get; }
+    }
+}
diff --git a/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IInterest.cs b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IInterest.cs
new file mode 100644
index 0000000..a824099
--- /dev/null
+++ b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IInterest.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IInterest : IId
+    {
+        string Title { get; }
+        string Description { get; }
+
+
+    }
+}
diff --git a/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IProduct.cs b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IProduct.cs
new file mode 100644
index 0000000..d0833a5
--- /dev/null
+++ b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IProduct.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IProduct : IId
+    {
+        string Title { get; }
+        string Description { get; }
+        DateTime DateCreate { get; }
+        int StudentId { get; }
+        Dictionary<int, IInterest> ProductInterests { get; }
+    }
+}
diff --git a/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IStudent.cs b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IStudent.cs
new file mode 100644
index 0000000..00dfbe1
--- /dev/null
+++ b/SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IStudent.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IStudent : IId
+    {
+        string Name { get; }
+        int Class { get; }
+        string Email { get; }
+        string Login { get; }
+        string Password { get; }
+        Dictionary<int, IInterest> StudentInterests { get; }
+    }
+}