diff --git a/Hotel/HotelContracts/BusinessLogicsContracts/IConferenceLogic.cs b/Hotel/HotelContracts/BusinessLogicsContracts/IConferenceLogic.cs
index ddf7543..7d049cd 100644
--- a/Hotel/HotelContracts/BusinessLogicsContracts/IConferenceLogic.cs
+++ b/Hotel/HotelContracts/BusinessLogicsContracts/IConferenceLogic.cs
@@ -1,6 +1,15 @@
-namespace HotelContracts.BusinessLogicsContracts
+using HotelContracts.BindingModels;
+using HotelContracts.SearchModels;
+using HotelContracts.ViewModels;
+
+namespace HotelContracts.BusinessLogicsContracts
 {
     public interface IConferenceLogic
     {
+        List<ConferenceViewModel>? ReadList(ConferenceSearchModel? model);
+        ConferenceViewModel? ReadElement(ConferenceSearchModel model);
+        bool Create(ConferenceBindingModel model);
+        bool Update(ConferenceBindingModel model);
+        bool Delete(ConferenceBindingModel model);
     }
 }
diff --git a/Hotel/HotelContracts/BusinessLogicsContracts/IMealPlanLogic.cs b/Hotel/HotelContracts/BusinessLogicsContracts/IMealPlanLogic.cs
new file mode 100644
index 0000000..c51a2b8
--- /dev/null
+++ b/Hotel/HotelContracts/BusinessLogicsContracts/IMealPlanLogic.cs
@@ -0,0 +1,15 @@
+using HotelContracts.BindingModels;
+using HotelContracts.SearchModels;
+using HotelContracts.ViewModels;
+
+namespace HotelContracts.BusinessLogicsContracts
+{
+    public interface IMealPlanLogic
+    {
+        List<MealPlanViewModel>? ReadList(MealPlanSearchModel? model);
+        MealPlanViewModel? ReadElement(MealPlanSearchModel model);
+        bool Create(MealPlanBindingModel model);
+        bool Update(MealPlanBindingModel model);
+        bool Delete(MealPlanBindingModel model);
+    }
+}
diff --git a/Hotel/HotelContracts/BusinessLogicsContracts/IMemberLogic.cs b/Hotel/HotelContracts/BusinessLogicsContracts/IMemberLogic.cs
new file mode 100644
index 0000000..b223660
--- /dev/null
+++ b/Hotel/HotelContracts/BusinessLogicsContracts/IMemberLogic.cs
@@ -0,0 +1,15 @@
+using HotelContracts.BindingModels;
+using HotelContracts.SearchModels;
+using HotelContracts.ViewModels;
+
+namespace HotelContracts.BusinessLogicsContracts
+{
+    public interface IMemberLogic
+    {
+        List<MemberViewModel>? ReadList(MemberSearchModel? model);
+        MemberViewModel? ReadElement(MemberSearchModel model);
+        bool Create(MemberBindingModel model);
+        bool Update(MemberBindingModel model);
+        bool Delete(MemberBindingModel model);
+    }
+}
diff --git a/Hotel/HotelContracts/BusinessLogicsContracts/IOrganiserLogic.cs b/Hotel/HotelContracts/BusinessLogicsContracts/IOrganiserLogic.cs
new file mode 100644
index 0000000..b2a85c9
--- /dev/null
+++ b/Hotel/HotelContracts/BusinessLogicsContracts/IOrganiserLogic.cs
@@ -0,0 +1,15 @@
+using HotelContracts.BindingModels;
+using HotelContracts.SearchModels;
+using HotelContracts.ViewModels;
+
+namespace HotelContracts.BusinessLogicsContracts
+{
+    public interface IOrganiserLogic
+    {
+        List<OrganiserViewModel>? ReadList(OrganiserSearchModel? model);
+        OrganiserViewModel? ReadElement(OrganiserSearchModel model);
+        bool Create(OrganiserBindingModel model);
+        bool Update(OrganiserBindingModel model);
+        bool Delete(OrganiserBindingModel model);
+    }
+}