diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IComponentLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IComponentLogic.cs
new file mode 100644
index 0000000..49f3039
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IComponentLogic.cs
@@ -0,0 +1,15 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.ViewModels;
+
+namespace ComputerHardwareStoreContracts.BusinessLogicsContracts
+{
+    public interface IComponentLogic
+    {
+        List<ComponentViewModel>? ReadList(ComponentSearchModel? model);
+        ComponentViewModel? ReadElement(ComponentSearchModel model);
+        bool Create(ComponentBindingModel model);
+        bool Update(ComponentBindingModel model);
+        bool Delete(ComponentBindingModel model);
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IOrderLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IOrderLogic.cs
new file mode 100644
index 0000000..fc0dc8e
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IOrderLogic.cs
@@ -0,0 +1,15 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.ViewModels;
+
+namespace ComputerHardwareStoreContracts.BusinessLogicsContracts
+{
+    public interface IOrderLogic
+    {
+        List<OrderViewModel>? ReadList(OrderSearchModel? model);
+        bool CreateOrder(OrderBindingModel model);
+        bool TakeOrderInWork(OrderBindingModel model);
+        bool FinishOrder(OrderBindingModel model);
+        bool DeliveryOrder(OrderBindingModel model);
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IProductLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IProductLogic.cs
new file mode 100644
index 0000000..59f4cdd
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IProductLogic.cs
@@ -0,0 +1,15 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.ViewModels;
+
+namespace ComputerHardwareStoreContracts.BusinessLogicsContracts
+{
+    public interface IProductLogic
+    {
+        List<ProductViewModel>? ReadList(ProductSearchModel? model);
+        ProductViewModel? ReadElement(ProductSearchModel model);
+        bool Create(ProductBindingModel model);
+        bool Update(ProductBindingModel model);
+        bool Delete(ProductBindingModel model);
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IStoreKeeperLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IStoreKeeperLogic.cs
new file mode 100644
index 0000000..b7a2fc0
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IStoreKeeperLogic.cs
@@ -0,0 +1,15 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.ViewModels;
+
+namespace ComputerHardwareStoreContracts.BusinessLogicsContracts
+{
+	public interface IStoreKeeperLogic
+    {
+		List<StoreKeeperViewModel>? ReadList(StoreKeeperSearchModel? model);
+		StoreKeeperViewModel? ReadElement(StoreKeeperSearchModel model);
+		bool Create(StoreKeeperBindingModel model);
+		bool Update(StoreKeeperBindingModel model);
+		bool Delete(StoreKeeperBindingModel model);
+	}
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IVendorLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IVendorLogic.cs
new file mode 100644
index 0000000..5f12939
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/BusinessLogicsContracts/IVendorLogic.cs
@@ -0,0 +1,15 @@
+using HardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.ViewModels;
+
+namespace ComputerHardwareStoreContracts.BusinessLogicsContracts
+{
+    public interface IVendorLogic
+    {
+        List<VendorViewModel>? ReadList(VendorSearchModel? model);
+        VendorViewModel? ReadElement(VendorSearchModel model);
+        bool Create(VendorBindingModel model);
+        bool Update(VendorBindingModel model);
+        bool Delete(VendorBindingModel model);
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/ComputerHardwareStoreContracts.csproj b/ComputerHardwareStore/ComputerHardwareStoreContracts/ComputerHardwareStoreContracts.csproj
index 4e4937a..9f4545e 100644
--- a/ComputerHardwareStore/ComputerHardwareStoreContracts/ComputerHardwareStoreContracts.csproj
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/ComputerHardwareStoreContracts.csproj
@@ -7,7 +7,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\ComputerHardwareStoreDataModels\ComputerHardwareStoreDataModels.csproj" />
+    <Compile Remove="BusinessLogicsContracts\IStoreKeeperLogic.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="BusinessLogicsContracts\IStoreKeeperLogic.cs" />
   </ItemGroup>
 
 </Project>