diff --git a/Course/DataModels/Models/IMachineModel.cs b/Course/DataModels/Models/IMachineModel.cs
new file mode 100644
index 0000000..36a8712
--- /dev/null
+++ b/Course/DataModels/Models/IMachineModel.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataModels.Models
+{
+    public interface IMachineModel : IId
+    {
+        string Title { get; }
+        string Country { get; }
+    }
+}
diff --git a/Course/DataModels/Models/IWorkerModel.cs b/Course/DataModels/Models/IWorkerModel.cs
index f525a39..d0a1fd0 100644
--- a/Course/DataModels/Models/IWorkerModel.cs
+++ b/Course/DataModels/Models/IWorkerModel.cs
@@ -10,7 +10,7 @@ namespace DataModels.Models
     {
         string Name { get; }
         DateTime Birthday { get; }
-        String Specialization { get; }
-        Double Salary { get; }
+        string Specialization { get; }
+        double Salary { get; }
     }
 }
diff --git a/Course/DataModels/Models/IWorkshopModel.cs b/Course/DataModels/Models/IWorkshopModel.cs
new file mode 100644
index 0000000..d3ddc13
--- /dev/null
+++ b/Course/DataModels/Models/IWorkshopModel.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataModels.Models
+{
+    public interface IWorkshopModel : IId
+    {
+        string Title { get; }
+        string Address { get; }
+        string Director { get; }
+    }
+}