diff --git a/MCTG/ConsoleApp/Menu/ConnectionMenu.cs b/MCTG/ConsoleApp/Menu/ConnectionMenu.cs
index d4c9949..ef410d2 100644
--- a/MCTG/ConsoleApp/Menu/ConnectionMenu.cs
+++ b/MCTG/ConsoleApp/Menu/ConnectionMenu.cs
@@ -3,7 +3,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-
+using ConsoleApp.Menu.Core;
+
 namespace ConsoleApp.Menu
 {
     internal class ConnectionMenu : Entry
diff --git a/MCTG/ConsoleApp/Menu/Entry.EntryStep.cs b/MCTG/ConsoleApp/Menu/Core/Entry.EntryStep.cs
similarity index 98%
rename from MCTG/ConsoleApp/Menu/Entry.EntryStep.cs
rename to MCTG/ConsoleApp/Menu/Core/Entry.EntryStep.cs
index b58a707..4193cb3 100644
--- a/MCTG/ConsoleApp/Menu/Entry.EntryStep.cs
+++ b/MCTG/ConsoleApp/Menu/Core/Entry.EntryStep.cs
@@ -4,7 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace ConsoleApp.Menu
+namespace ConsoleApp.Menu.Core
 {
     internal abstract partial class Entry
     {
diff --git a/MCTG/ConsoleApp/Menu/Entry.cs b/MCTG/ConsoleApp/Menu/Core/Entry.cs
similarity index 98%
rename from MCTG/ConsoleApp/Menu/Entry.cs
rename to MCTG/ConsoleApp/Menu/Core/Entry.cs
index 3a84fff..c1702d3 100644
--- a/MCTG/ConsoleApp/Menu/Entry.cs
+++ b/MCTG/ConsoleApp/Menu/Core/Entry.cs
@@ -3,8 +3,9 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-
-namespace ConsoleApp.Menu
+using ConsoleApp.Menu.Core;
+
+namespace ConsoleApp.Menu.Core
 {
     /// <summary>
     /// Define an Entry menu.
diff --git a/MCTG/ConsoleApp/Menu/IMenu.cs b/MCTG/ConsoleApp/Menu/Core/IMenu.cs
similarity index 95%
rename from MCTG/ConsoleApp/Menu/IMenu.cs
rename to MCTG/ConsoleApp/Menu/Core/IMenu.cs
index 120a387..813d91e 100644
--- a/MCTG/ConsoleApp/Menu/IMenu.cs
+++ b/MCTG/ConsoleApp/Menu/Core/IMenu.cs
@@ -5,7 +5,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace ConsoleApp.Menu
+namespace ConsoleApp.Menu.Core
 {
     /// <summary>
     /// Define a console menu with element selection.
diff --git a/MCTG/ConsoleApp/Menu/Menu.cs b/MCTG/ConsoleApp/Menu/Core/Menu.cs
similarity index 95%
rename from MCTG/ConsoleApp/Menu/Menu.cs
rename to MCTG/ConsoleApp/Menu/Core/Menu.cs
index 68962db..668b1ae 100644
--- a/MCTG/ConsoleApp/Menu/Menu.cs
+++ b/MCTG/ConsoleApp/Menu/Core/Menu.cs
@@ -7,7 +7,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace ConsoleApp.Menu
+namespace ConsoleApp.Menu.Core
 {
     /// <summary>
     /// Define a selection menu.
@@ -44,7 +44,7 @@ namespace ConsoleApp.Menu
             {
                 _currentLine = value;
                 if (_currentLine <= 0) _currentLine = 0;
-                else if (_currentLine >= _selectList.Count) _currentLine = _selectList.Count-1;
+                else if (_currentLine >= _selectList.Count) _currentLine = _selectList.Count - 1;
             }
         }
 
@@ -75,7 +75,7 @@ namespace ConsoleApp.Menu
         /// </summary>
         /// <param name="title">The title of the menu.</param>
         /// <param name="selections">The selections of the menu.</param>
-        protected Menu(string title, params Selector<T>[] selections ) : this(title)
+        protected Menu(string title, params Selector<T>[] selections) : this(title)
         {
             if (selections == null || selections.Length == 0)
             {
diff --git a/MCTG/ConsoleApp/Menu/PlainText.cs b/MCTG/ConsoleApp/Menu/Core/PlainText.cs
similarity index 96%
rename from MCTG/ConsoleApp/Menu/PlainText.cs
rename to MCTG/ConsoleApp/Menu/Core/PlainText.cs
index d5deee1..6439c62 100644
--- a/MCTG/ConsoleApp/Menu/PlainText.cs
+++ b/MCTG/ConsoleApp/Menu/Core/PlainText.cs
@@ -3,8 +3,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-
-namespace ConsoleApp.Menu
+
+namespace ConsoleApp.Menu.Core
 {
     /// <summary>
     /// Define a Plain text menu.
@@ -36,16 +36,16 @@ namespace ConsoleApp.Menu
         public StringBuilder InputStr { get; set; }
 
         public void DisableWriteMode()
-        { 
-            // Plain text does not need to do anything for this.
+        {
+            // Plain text does not need to do anything for this.
         }
         public void EnableWriteMode()
-        { 
-            // Plain text does not need to do anything for this.
+        {
+            // Plain text does not need to do anything for this.
         }
         public void SelectNext()
-        { 
-            // Plain text does not need to do anything for this.
+        {
+            // Plain text does not need to do anything for this.
         }
         public void SelectPrevious()
         {
diff --git a/MCTG/ConsoleApp/Menu/Selector.cs b/MCTG/ConsoleApp/Menu/Core/Selector.cs
similarity index 91%
rename from MCTG/ConsoleApp/Menu/Selector.cs
rename to MCTG/ConsoleApp/Menu/Core/Selector.cs
index f8f71e0..6dce8f0 100644
--- a/MCTG/ConsoleApp/Menu/Selector.cs
+++ b/MCTG/ConsoleApp/Menu/Core/Selector.cs
@@ -7,7 +7,7 @@ using System.Reflection.Emit;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace ConsoleApp.Menu
+namespace ConsoleApp.Menu.Core
 {
     /// <summary>
     /// The selector of a menu.
@@ -22,7 +22,8 @@ namespace ConsoleApp.Menu
         /// <summary>
         /// The string that are displayed on the menu.
         /// </summary>
-        public string Line { 
+        public string Line
+        {
             get => _line;
             private set
             {
@@ -57,7 +58,7 @@ namespace ConsoleApp.Menu
         {
             if (other == null) return false;
             if (other == this) return true;
-            return other.Line.Equals(this.Line);
+            return other.Line.Equals(Line);
         }
 
         public override bool Equals(object? obj)
diff --git a/MCTG/ConsoleApp/Menu/MainMenu.cs b/MCTG/ConsoleApp/Menu/MainMenu.cs
index 8dcbb8b..9bdc7ad 100644
--- a/MCTG/ConsoleApp/Menu/MainMenu.cs
+++ b/MCTG/ConsoleApp/Menu/MainMenu.cs
@@ -5,7 +5,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-
+using ConsoleApp.Menu.Core;
+
 namespace ConsoleApp.Menu
 {
     /// <summary>
diff --git a/MCTG/ConsoleApp/Menu/SearcherRecipe.cs b/MCTG/ConsoleApp/Menu/SearcherRecipe.cs
index b7dea49..b3460b8 100644
--- a/MCTG/ConsoleApp/Menu/SearcherRecipe.cs
+++ b/MCTG/ConsoleApp/Menu/SearcherRecipe.cs
@@ -4,7 +4,7 @@ using System.Linq;
 using System.Security.Cryptography.X509Certificates;
 using System.Text;
 using System.Threading.Tasks;
-
+using ConsoleApp.Menu.Core;
 using Model;
 
 namespace ConsoleApp.Menu
diff --git a/MCTG/ConsoleApp/MenuManager.cs b/MCTG/ConsoleApp/MenuManager.cs
index 20cf567..7fb9a70 100644
--- a/MCTG/ConsoleApp/MenuManager.cs
+++ b/MCTG/ConsoleApp/MenuManager.cs
@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using ConsoleApp.Menu.Core;
 
 namespace ConsoleApp
 {
@@ -23,7 +24,7 @@ namespace ConsoleApp
         /// <summary>
         /// Each menu called are push in this stack. Then, to return back, we pop this stack to retrive the previous menu.
         /// </summary>
-        public Stack<Menu.IMenu> MenuCallStack { get; set; }
+        public Stack<IMenu> MenuCallStack { get; set; }
         #endregion
 
         #region Constructors
@@ -32,11 +33,11 @@ namespace ConsoleApp
         /// </summary>
         /// <param name="dataManager">The data manager needed by the menus inside.</param>
         /// <param name="firstMenu">The starting menu, the first that will be push on the call stack.</param>
-        public MenuManager(DataManager dataManager, Menu.IMenu firstMenu)
+        public MenuManager(DataManager dataManager, IMenu firstMenu)
         {
             DataManager = dataManager;
 
-            MenuCallStack = new Stack<Menu.IMenu>();
+            MenuCallStack = new Stack<IMenu>();
             MenuCallStack.Push(firstMenu);
         }
 
@@ -55,7 +56,7 @@ namespace ConsoleApp
         public void Loop()
         {
             ConsoleKeyInfo cki;
-            Menu.IMenu menuOnHead;
+            IMenu menuOnHead;
             do
             {
                 menuOnHead = MenuCallStack.Peek();
@@ -72,7 +73,7 @@ namespace ConsoleApp
                         menuOnHead.SelectPrevious();
                         break;
                     case ConsoleKey.Enter:
-                        Menu.IMenu? retMenu = menuOnHead.Return();
+                        IMenu? retMenu = menuOnHead.Return();
                         if (retMenu is null) MenuCallStack.Pop();
                         else MenuCallStack.Push(retMenu);
                         break;
diff --git a/MCTG/Model/Managers/MasterManager.cs b/MCTG/Model/Managers/MasterManager.cs
new file mode 100644
index 0000000..a093e71
--- /dev/null
+++ b/MCTG/Model/Managers/MasterManager.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Model.Managers
+{
+    public class MasterManager
+    {
+        public static User? CurrentConnectedUser;
+        public static RecipeCollection? Recipes;
+        public static List<User>? Users;
+
+        public DataManager DataMgr { get; private set; }
+
+        public MasterManager(IDataManager dataManager)
+        {
+            DataMgr = new DataManager(dataManager);
+            Recipes = DataMgr.GetRecipes("all recipes");
+            Users = DataMgr.GetUsers();
+            CurrentConnectedUser = null;
+        }
+
+        public bool LogIn(string mail, string password)
+        {
+            if (Users is null)
+                throw new ArgumentNullException();
+
+            User user = (User)(from u in Users
+                               where u.Mail == mail
+                               select u);
+        }
+    }
+}
diff --git a/MCTG/Model/User/User.cs b/MCTG/Model/User/User.cs
index f335472..22ed1ba 100644
--- a/MCTG/Model/User/User.cs
+++ b/MCTG/Model/User/User.cs
@@ -131,7 +131,6 @@ namespace Model
 
         #endregion
 
-
         #region Constructors
 
         /// <summary>
@@ -159,7 +158,5 @@ namespace Model
     
 
         #endregion
-
-
     }
 }