diff --git a/Interfaces/IXIdentityBaseReferencedProvider.cs b/Interfaces/IXIdentityBaseReferencedProvider.cs
new file mode 100644
index 0000000..09264c9
--- /dev/null
+++ b/Interfaces/IXIdentityBaseReferencedProvider.cs
@@ -0,0 +1,140 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using xDataService.Models;
+using xIdentityModels.Models;
+using xModels.Dtos;
+
+namespace xIdentityService.Interfaces
+{
+    /// <summary>
+    /// in Some Cases we have Entities Which Can Referenced for Specified 
+    /// Provider and Types ...
+    /// this interface Globaly introduce all available Actions for those ...
+    /// 
+    /// TKey: type of Provider Models Keys ...
+    /// TModel: type of Dto which Referenced ...
+    /// </summary>
+    public interface IXIdentityBaseReferencedProvider<TModel, TKey>
+    {
+        //
+        #region Props ...
+        /// <summary>
+        /// Provider Identifier ...
+        /// </summary>
+        string Provider { get; }
+        #endregion
+
+        //
+        #region Identifier ...
+        Task<int> LastIndex(TKey providedForId);
+        #endregion
+
+        //
+        #region Referenced Actions ...
+        /// <summary>
+        /// Get Specified Indexed Reference for Specific Provided ID ...
+        /// </summary>
+        /// <param name="providedForId"></param>
+        /// <param name="forIndex"></param>
+        /// <returns></returns>
+        Task<TModel> GetReference(
+            TKey providedForId,
+            int forIndex = 0
+        );
+
+        /// <summary>
+        /// Retrieve all Exists References of Specific Provided ID ...
+        /// </summary>
+        /// <param name="providedForId"></param>
+        /// <returns></returns>
+        Task<IEnumerable<TModel>> GetAllReferences(TKey providedForId);
+
+        /// <summary>
+        /// Retrieve References of Specific Provided ID as Query ...
+        /// </summary>
+        /// <param name="providedForId"></param>
+        /// <returns></returns>
+        Task<XQueryResult<TModel>> QueryReferences(
+            XQuery query,
+            TKey providedForId
+        );
+
+        /// <summary>
+        /// Add Reference a Model to Specific Provided ID ...
+        /// </summary>
+        /// <param name="model"></param>
+        /// <param name="providedForId"></param>
+        /// <param name="forIndex"></param>
+        /// <param name="connectionId"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<bool> AddReference(
+            TModel model,
+            TKey providedForId,
+            int forIndex = 0,
+            string connectionId = null,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// Add Reference a Model to Specific XRefence<TKey> ...
+        /// </summary>
+        /// <param name="model"></param>
+        /// <param name="reference"></param>
+        /// <param name="connectionId"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<bool> AddReference(
+            TModel model,
+            XReference<TKey> reference,
+            string connectionId = null,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// Remove Reference a Model for Specific Provided ID ...
+        /// </summary>
+        /// <param name="model"></param>
+        /// <param name="providedForId"></param>
+        /// <param name="forIndex">if null, removes all</param>
+        /// <param name="connectionId"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<bool> RemoveReference(
+            TModel model,
+            TKey providedForId,
+            int? forIndex = null,
+            string connectionId = null,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// Remove Reference a Model for Specific XRefence<TKey> ...
+        /// </summary>
+        /// <param name="model"></param>
+        /// <param name="providedForId"></param>
+        /// <param name="connectionId"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<bool> RemoveReference(
+            TModel model,
+            XReference<TKey> reference,
+            string connectionId = null,
+            XUserClaimsInfoDto userInfo = null
+        );
+
+        /// <summary>
+        /// Remove All References to Specified Key ...
+        /// </summary>
+        /// <param name="providedForId"></param>
+        /// <param name="connectionId"></param>
+        /// <param name="userInfo"></param>
+        /// <returns></returns>
+        Task<bool> RemoveReferences(
+            TKey providedForId,
+            string connectionId = null,
+            XUserClaimsInfoDto userInfo = null
+        );
+        #endregion
+    }
+}
\ No newline at end of file