diff --git a/DataCenter_Windows/WindowsDataCenter/Interfaces/IRepository.cs b/DataCenter_Windows/WindowsDataCenter/Interfaces/IRepository.cs
index b376c7f..8e02407 100644
--- a/DataCenter_Windows/WindowsDataCenter/Interfaces/IRepository.cs
+++ b/DataCenter_Windows/WindowsDataCenter/Interfaces/IRepository.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 
 namespace Interfaces
 {
@@ -12,16 +13,6 @@ namespace Interfaces
         /// plus a total user count. Pagination options are supported.
         /// </returns>
         UserList GetUsers(int pageNumber=-1, int pageSize=-1);
-        ///// <summary>
-        ///// Get a paginated list of users
-        ///// </summary>
-        ///// <param name="pageNumber">The number of the page to retrieve</param>
-        ///// <param name="pageSize">The size of the pages</param>
-        ///// <returns>
-        ///// Returns <see cref="UserList"/> with full list of users,
-        ///// plus a total user count. Pagination options are supported.
-        ///// </returns>
-        //UserList GetUsers(int pageNumber, int pageSize);
         /// <summary>
         /// Search the user list for the following string
         /// </summary>
@@ -105,5 +96,10 @@ namespace Interfaces
         /// <see cref="OperationResponse"/> to indicate procedure status.
         /// </returns>
         OperationResponse LogEventTime(Identifier identifier, out int logId);
+
+        OperationResponse CreateGroup(Group group, out int groupId);
+        List<Group> GetGroups(int userId = -1);
+        OperationResponse UpdateGroup(Group group);
+        OperationResponse DeleteGroup(int groupId);
     }
 }