diff --git a/WD7UVN_HFT_2023241.Logic/Class1.cs b/WD7UVN_HFT_2023241.Logic/Class1.cs
deleted file mode 100644
index 4313f5c..0000000
--- a/WD7UVN_HFT_2023241.Logic/Class1.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-using System;
-
-namespace WD7UVN_HFT_2023241.Logic
-{
-    public class Class1
-    {
-    }
-}
diff --git a/WD7UVN_HFT_2023241.Logic/LogicServices.cs b/WD7UVN_HFT_2023241.Logic/LogicServices.cs
new file mode 100644
index 0000000..fa5472e
--- /dev/null
+++ b/WD7UVN_HFT_2023241.Logic/LogicServices.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Linq;
+using WD7UVN_HFT_2023241.Models;
+using WD7UVN_HFT_2023241.Repository;
+
+namespace WD7UVN_HFT_2023241.Logic
+{
+    public interface ILogicServices
+    {
+        public ICRUD CRUDOperations { get; set; }
+
+        //additional, non-CRUD operations
+
+        public IQueryable<Employee> WhoWorksInMaintainerTeam(int maintainerTeamId)
+        {
+            return CRUDOperations
+            .ReadAllEmployees()
+            .Where(e => e.MAINTAINER_ID == maintainerTeamId);
+        }
+
+        public IQueryable<Employee> GetSubordinates(int managerId)
+        {
+            return CRUDOperations
+            .ReadAllEmployees()
+            .Where(e => e.MANAGER_ID == managerId);
+        }
+
+        public IQueryable<Customer> WhoUsesService(int serviceId)
+        {
+            return CRUDOperations
+            .ReadAllCustomers()
+            .Where(c => c.SERVICE_ID == serviceId);
+        }
+    }
+
+    public class LogicServices : ILogicServices
+    {
+        public ICRUD CRUDOperations { get; set; }
+
+        public LogicServices(ICRUD CRUDOperations)
+        {
+            this.CRUDOperations = CRUDOperations;
+        }
+    }
+}