diff --git a/PapaCarloProject/PapaCarloContracts/BusinessLogicContracts/IBlankBusinessLogicContract.cs b/PapaCarloProject/PapaCarloContracts/BusinessLogicContracts/IBlankBusinessLogicContract.cs
new file mode 100644
index 0000000..712957a
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/BusinessLogicContracts/IBlankBusinessLogicContract.cs
@@ -0,0 +1,18 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.BusinessLogicContracts;
+
+public interface IBlankBusinessLogicContract
+{
+    List<BlankDataModel> GetAllBlanks();
+    BlankDataModel GetBlankByData(string data);
+    void InsertBlank(BlankDataModel blankDataModel);
+    void UpdateBlank(BlankDataModel blankDataModel);
+    void DeleteBlank(string id);
+}
+
diff --git a/PapaCarloProject/PapaCarloContracts/BusinessLogicContracts/IPostBusinessLogicContract.cs b/PapaCarloProject/PapaCarloContracts/BusinessLogicContracts/IPostBusinessLogicContract.cs
new file mode 100644
index 0000000..68d4d83
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/BusinessLogicContracts/IPostBusinessLogicContract.cs
@@ -0,0 +1,20 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.BuisinessLogicsContracts;
+
+public interface IPostBusinessLogicContract
+{
+    List<PostDataModel> GetAllPosts(bool onlyActive);
+    List<PostDataModel> GetAllDataOfPost(string postId);
+    PostDataModel GetPostByData(string data);
+    void InsertPost(PostDataModel postDataModel);
+    void UpdatePost(PostDataModel postDataModel);
+    void DeletePost(string id);
+    void RestorePost(string id);
+}
+
diff --git a/PapaCarloProject/PapaCarloContracts/StoragesContracts/IBlankStorageContract.cs b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IBlankStorageContract.cs
new file mode 100644
index 0000000..6889f15
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IBlankStorageContract.cs
@@ -0,0 +1,19 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.StoragesContracts;
+
+public interface IManufacturerStorageContract
+{
+    List<BlankDataModel> GetList();
+    BlankDataModel? GetElementById(string id);
+    BlankDataModel? GetElementByName(string name);
+    BlankDataModel? GetElementByOldName(string name);
+    void AddElement(BlankDataModel blankDataModel);
+    void UpdElement(BlankDataModel blankDataModel);
+    void DelElement(string id);
+}
diff --git a/PapaCarloProject/PapaCarloContracts/StoragesContracts/ICuttingStorageContract.cs b/PapaCarloProject/PapaCarloContracts/StoragesContracts/ICuttingStorageContract.cs
new file mode 100644
index 0000000..64aa215
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/StoragesContracts/ICuttingStorageContract.cs
@@ -0,0 +1,18 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.StoragesContracts;
+
+public interface ISaleStorageContract
+{
+    List<CuttingDataModel> GetList(DateTime? startDate = null, DateTime? endDate =
+    null, string? workerId = null, string? blankId = null, string? productId = null);
+    CuttingDataModel? GetElementById(string id);
+    void AddElement(CuttingDataModel cuttingDataModel);
+    void DelElement(string id);
+}
+
diff --git a/PapaCarloProject/PapaCarloContracts/StoragesContracts/IPostStorageContract.cs b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IPostStorageContract.cs
new file mode 100644
index 0000000..715ff65
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IPostStorageContract.cs
@@ -0,0 +1,20 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.StoragesContracts;
+
+public interface IPostStorageContract
+{
+    List<PostDataModel> GetList(bool onlyActual = true);
+    List<PostDataModel> GetPostWithHistory(string postId);
+    PostDataModel? GetElementById(string id);
+    PostDataModel? GetElementByName(string name);
+    void AddElement(PostDataModel postDataModel);
+    void UpdElement(PostDataModel postDataModel);
+    void DelElement(string id);
+    void ResElement(string id);
+}
diff --git a/PapaCarloProject/PapaCarloContracts/StoragesContracts/IProductStorageContract.cs b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IProductStorageContract.cs
new file mode 100644
index 0000000..f5ce719
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IProductStorageContract.cs
@@ -0,0 +1,20 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.StoragesContracts;
+
+public interface IProductStorageContract
+{
+    List<ProductDataModel> GetList(bool onlyActive = true, string? blankId = null);
+    List<ProductHistoryDataModel> GetHistoryByProductId(string productId);
+    ProductDataModel? GetElementById(string id);
+    ProductDataModel? GetElementByName(string name);
+    void AddElement(ProductDataModel productDataModel);
+    void UpdElement(ProductDataModel productDataModel);
+void DelElement(string id);
+}
+
diff --git a/PapaCarloProject/PapaCarloContracts/StoragesContracts/ISalaryStorageContract.cs b/PapaCarloProject/PapaCarloContracts/StoragesContracts/ISalaryStorageContract.cs
new file mode 100644
index 0000000..b230ce3
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/StoragesContracts/ISalaryStorageContract.cs
@@ -0,0 +1,15 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.StoragesContracts;
+public interface ISalaryStorageContract
+{
+    List<SalaryDataModel> GetList(DateTime startDate, DateTime endDate, string?
+    workerId = null);
+    void AddElement(SalaryDataModel salaryDataModel);
+}
+
diff --git a/PapaCarloProject/PapaCarloContracts/StoragesContracts/IWorkerStorageContract.cs b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IWorkerStorageContract.cs
new file mode 100644
index 0000000..b954d0d
--- /dev/null
+++ b/PapaCarloProject/PapaCarloContracts/StoragesContracts/IWorkerStorageContract.cs
@@ -0,0 +1,21 @@
+using PapaCarloContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PapaCarloContracts.StoragesContracts;
+
+public interface IWorkerStorageContract
+{
+    List<WorkerDataModel> GetList(bool onlyActive = true, string? postId =
+    null, DateTime? fromBirthDate = null, DateTime? toBirthDate = null, DateTime?
+    fromEmploymentDate = null, DateTime? toEmploymentDate = null);
+    WorkerDataModel? GetElementById(string id);
+    WorkerDataModel? GetElementByFIO(string fio);
+    void AddElement(WorkerDataModel workerDataModel);
+    void UpdElement(WorkerDataModel workerDataModel);
+    void DelElement(string id);
+}
+