diff --git a/Hotel/HotelDataModels/Models/IConferenceModel.cs b/Hotel/HotelDataModels/Models/IConferenceModel.cs
index 041e8d0..d88662d 100644
--- a/Hotel/HotelDataModels/Models/IConferenceModel.cs
+++ b/Hotel/HotelDataModels/Models/IConferenceModel.cs
@@ -1,6 +1,8 @@
 namespace HotelDataModels.Models
 {
-    public interface IConferenceModel
+    public interface IConferenceModel : IId
     {
+        string ConferenceName { get; }
+        DateTime StartDate { get; }
     }
 }
diff --git a/Hotel/HotelDataModels/Models/IMealPlanModel.cs b/Hotel/HotelDataModels/Models/IMealPlanModel.cs
index dbd8eb1..2356b02 100644
--- a/Hotel/HotelDataModels/Models/IMealPlanModel.cs
+++ b/Hotel/HotelDataModels/Models/IMealPlanModel.cs
@@ -1,6 +1,8 @@
 namespace HotelDataModels.Models
 {
-    public interface IMealPlanModel
+    public interface IMealPlanModel : IId
     {
+        string MealPlanName { get; }
+        double MealPlanPrice { get; }
     }
 }
diff --git a/Hotel/HotelDataModels/Models/IMemberModel.cs b/Hotel/HotelDataModels/Models/IMemberModel.cs
index 053f60c..5fedf49 100644
--- a/Hotel/HotelDataModels/Models/IMemberModel.cs
+++ b/Hotel/HotelDataModels/Models/IMemberModel.cs
@@ -1,6 +1,8 @@
 namespace HotelDataModels.Models
 {
-    public interface IMemberModel
+    public interface IMemberModel : IId
     {
+        string MemberFIO { get; }
+        string Citizenship { get; }
     }
 }
diff --git a/Hotel/HotelDataModels/Models/IOrganiserModel.cs b/Hotel/HotelDataModels/Models/IOrganiserModel.cs
index f066a83..3b82980 100644
--- a/Hotel/HotelDataModels/Models/IOrganiserModel.cs
+++ b/Hotel/HotelDataModels/Models/IOrganiserModel.cs
@@ -1,6 +1,11 @@
 namespace HotelDataModels.Models
 {
-    public interface IOrganiserModel
+    public interface IOrganiserModel : IId
     {
+        string OrganiserFIO { get; }
+        string OrganiserPassword { get; }
+        string OrganiserLogin { get; }
+        string OrganiserEmail { get; }
+        string OrganiserNumber { get; }
     }
 }