diff --git a/Hotel/HotelDataModels/Models/IConferenceModel.cs b/Hotel/HotelDataModels/Models/IConferenceModel.cs
new file mode 100644
index 0000000..38a9d14
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IConferenceModel.cs
@@ -0,0 +1,10 @@
+namespace HotelDataModels.Models
+{
+    public interface IConferenceModel : IId
+    {
+        string ConferenceName { get; }
+        DateTime StartDate { get; }
+        int OrganiserId { get; }
+        public Dictionary<int, IMemberModel> ConferenceMembers { get; }
+    }
+}
diff --git a/Hotel/HotelDataModels/Models/IMealPlanModel.cs b/Hotel/HotelDataModels/Models/IMealPlanModel.cs
new file mode 100644
index 0000000..53fc27f
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IMealPlanModel.cs
@@ -0,0 +1,10 @@
+namespace HotelDataModels.Models
+{
+    public interface IMealPlanModel : IId
+    {
+        string MealPlanName { get; }
+        double MealPlanPrice { get; }
+        int OrganiserId { get; }
+        public Dictionary<int, IMemberModel> MealPlanMembers { get; }
+    }
+}
diff --git a/Hotel/HotelDataModels/Models/IMemberModel.cs b/Hotel/HotelDataModels/Models/IMemberModel.cs
new file mode 100644
index 0000000..2f2a915
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IMemberModel.cs
@@ -0,0 +1,11 @@
+namespace HotelDataModels.Models
+{
+    public interface IMemberModel : IId
+    {
+        string MemberSurname { get; }
+        string MemberName { get; }
+        string MemberPatronymic { get; }
+        string MemberPhoneNumber { get; }
+        int OrganiserId { get; }
+    }
+}
diff --git a/Hotel/HotelDataModels/Models/IOrganiserModel.cs b/Hotel/HotelDataModels/Models/IOrganiserModel.cs
new file mode 100644
index 0000000..eace162
--- /dev/null
+++ b/Hotel/HotelDataModels/Models/IOrganiserModel.cs
@@ -0,0 +1,13 @@
+namespace HotelDataModels.Models
+{
+    public interface IOrganiserModel : IId
+    {
+        string OrganiserSurname { get; }
+        string OrganiserName { get; }
+        string OrganiserPatronymic { get; }
+        string OrganiserLogin { get; }
+        string OrganiserPassword { get; }
+        string OrganiserEmail { get; }
+        string OrganiserPhoneNumber { get; }
+    }
+}