diff --git a/Shared/Interfaces/IEventRegistrationService.cs b/Shared/Interfaces/IEventRegistrationService.cs
index 28fa34e..769409f 100644
--- a/Shared/Interfaces/IEventRegistrationService.cs
+++ b/Shared/Interfaces/IEventRegistrationService.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 
@@ -5,14 +6,21 @@ namespace SZUAbsolventenverein.Module.EventRegistration.Services
 {
     public interface IEventRegistrationService 
     {
-        Task<List<Models.Event>> GetEventRegistrationsAsync(int ModuleId);
+        /* Reine Events */
+        Task<List<Models.Event>> GetEventsAsync(int ModuleId);
 
-        Task<Models.Event> GetEventRegistrationAsync(int EventRegistrationId, int ModuleId);
+        Task<Models.Event> AddEventAsync(Models.Event NewEvent);
 
-        Task<Models.Event> AddEventRegistrationAsync(Models.Event EventRegistration);
+        Task<Models.Event> UpdateEventAsync(Models.Event NewEvent);
 
-        Task<Models.Event> UpdateEventRegistrationAsync(Models.Event EventRegistration);
+        Task DeleteEventAsync(int EventId, int ModuleId);
 
-        Task DeleteEventRegistrationAsync(int EventRegistrationId, int ModuleId);
+
+        /* Events & Responses */
+        Task<Models.Response> AddOrUpdateResponseAsync(int EventId, int ModuleId, bool ResponseType);
+
+        Task<(Models.Event, Models.Response)> GetEventDetails(int EventId, int ModuleId);
+
+        Task<List<Models.Response>> GetEventResponses(int EventId, int ModuleId);
     }
 }