diff --git a/MCTG/ConsoleApp/Menu/AddUserMenu.cs b/MCTG/ConsoleApp/Menu/AddUserMenu.cs
index 41acc62..49d6a57 100644
--- a/MCTG/ConsoleApp/Menu/AddUserMenu.cs
+++ b/MCTG/ConsoleApp/Menu/AddUserMenu.cs
@@ -24,7 +24,7 @@ namespace ConsoleApp.Menu
             string surname = _selectList[2].Item.Input;
             string passwd = _selectList[3].Item.Input;
 
-            User user = masterMgr.User.CreateUser(name, surname, mail, passwd, null);
+            User user = masterMgr.User.CreateUser(mail, passwd, name, surname);
 
             masterMgr.User.AddUserToData(user);
             return null;
diff --git a/MCTG/Managers/UserDefaultManager.cs b/MCTG/Managers/UserDefaultManager.cs
index c96a662..db94186 100644
--- a/MCTG/Managers/UserDefaultManager.cs
+++ b/MCTG/Managers/UserDefaultManager.cs
@@ -41,7 +41,8 @@ namespace Managers
             return true;
         }
 
-        public User CreateUser(string? name, string? surname, string mail, string password, string? profilePict)
+        public User CreateUser(string mail, string password,
+                               string? name = null, string? surname = null, string? profilePict = null)
         {
             if (name is null) name = $"user{GetRandomInt()}";
             if (surname is null) surname = "";
diff --git a/MCTG/Model/Managers/IDataManager.cs b/MCTG/Model/Managers/IDataManager.cs
index 267c4af..ccd40c7 100644
--- a/MCTG/Model/Managers/IDataManager.cs
+++ b/MCTG/Model/Managers/IDataManager.cs
@@ -7,6 +7,9 @@ using System.Threading.Tasks;
 
 namespace Model
 {
+    /// <summary>
+    /// Define how to manage data.
+    /// </summary>
     public interface IDataManager
     {
         /// <summary>
diff --git a/MCTG/Model/Managers/IPasswordManager.cs b/MCTG/Model/Managers/IPasswordManager.cs
index 5ca0732..59d85d7 100644
--- a/MCTG/Model/Managers/IPasswordManager.cs
+++ b/MCTG/Model/Managers/IPasswordManager.cs
@@ -6,10 +6,24 @@ using System.Threading.Tasks;
 
 namespace Model
 {
+    /// <summary>
+    /// Define how to manage passwords.
+    /// </summary>
     public interface IPasswordManager
     {
+        /// <summary>
+        /// Hash a plain text password.
+        /// </summary>
+        /// <param name="password">The plain password to hash.</param>
+        /// <returns>The hashed password.</returns>
         public string HashPassword(string password);
-        public bool VerifyPassword(string hashedPassword,string password);
 
+        /// <summary>
+        /// Verify a plain text password with a hashed one.
+        /// </summary>
+        /// <param name="hashedPassword">The hashed password.</param>
+        /// <param name="password">The plain text password.</param>
+        /// <returns>True is the password is correct, false otherwise.</returns>
+        public bool VerifyPassword(string hashedPassword,string password);
     }
 }
diff --git a/MCTG/Model/Managers/IRecipeManager.cs b/MCTG/Model/Managers/IRecipeManager.cs
index 093fbae..5a7fe22 100644
--- a/MCTG/Model/Managers/IRecipeManager.cs
+++ b/MCTG/Model/Managers/IRecipeManager.cs
@@ -6,16 +6,62 @@ using System.Threading.Tasks;
 
 namespace Model
 {
+    /// <summary>
+    /// Define how to manage recipes.
+    /// </summary>
     public interface IRecipeManager
     {
+        /// <summary>
+        /// Get or set the currently selected recipe.
+        /// </summary>
         Recipe? CurrentSelected { get; set; }
 
+        /// <summary>
+        /// Get all the recipe in the data.
+        /// </summary>
+        /// <returns>The RecipeCollection containing the recipes stored in the data.</returns>
         RecipeCollection GetAllRecipes();
+
+        /// <summary>
+        /// Get the recipe corresponding to the id.
+        /// </summary>
+        /// <param name="id">The id of the recipe we want.</param>
+        /// <returns>The recipe corresponding to the id.</returns>
         Recipe GetRecipeFromId(int id);
+
+        /// <summary>
+        /// Search in data the recipes containing this part of title.
+        /// </summary>
+        /// <param name="title">Search string.</param>
+        /// <returns>The RecipeCollection of recipes corresponding to the search.</returns>
         RecipeCollection SearchRecipeByTitle(string title);
+
+        /// <summary>
+        /// Get all the recipes created by the author.
+        /// </summary>
+        /// <param name="authorMail">The author's mail.</param>
+        /// <returns>The RecipeCollection of the recipe created by the author.</returns>
         RecipeCollection GetRecipeByAuthor(string authorMail);
+
+        /// <summary>
+        /// Get an ordored list of the recipes sorted by the priority list.
+        /// </summary>
+        /// <param name="priority">The priority list.</param>
+        /// <returns>The RecipeCollection ordored by the priority list.</returns>
         RecipeCollection GetRecipesByPriorityOrder(IEnumerable<Priority> priority);
+
+        /// <summary>
+        /// Add a recipe to the data.
+        /// </summary>
+        /// <param name="recipe">The recipe to add.</param>
+        /// <returns>Weither the adding succed or not.</returns>
         bool AddRecipeToData(Recipe recipe);
+
+        /// <summary>
+        /// Modify the <see cref="CurrentSelected"/> recipe with a new one in the data.
+        /// </summary>
+        /// <param name="newRecipe">The new recipe</param>
+        /// <returns>Weither the modification succed or not.</returns>
         bool ModifyCurrentSelected(Recipe newRecipe);
     }
 }
diff --git a/MCTG/Model/Managers/IUserManager.cs b/MCTG/Model/Managers/IUserManager.cs
index 5babaf4..c4c7195 100644
--- a/MCTG/Model/Managers/IUserManager.cs
+++ b/MCTG/Model/Managers/IUserManager.cs
@@ -6,14 +6,52 @@ using System.Threading.Tasks;
 
 namespace Model
 {
+    /// <summary>
+    /// Define how to manage an user.
+    /// </summary>
     public interface IUserManager
     {
+        /// <summary>
+        /// Get the current connected user. Null if no user is connected.
+        /// </summary>
         User? CurrentConnected { get; }
+
+        /// <summary>
+        /// Get the password manager used to hash passords.
+        /// </summary>
         IPasswordManager PasswordManager { get; }
 
+        /// <summary>
+        /// Get a collection of all users in the data.
+        /// </summary>
+        /// <returns>A collection of all user.</returns>
         ICollection<User> GetAllUsers();
+
+        /// <summary>
+        /// Get an user by his email.
+        /// </summary>
+        /// <param name="mail">The user's mail.</param>
+        /// <returns>The user corresponding to the mail.</returns>
         User GetUserFromMail(string mail);
-        User CreateUser(string? name, string? surname, string mail, string password, string? profilePict);
+
+        /// <summary>
+        /// Create a new user. The mail and the password are required. Other can be null.
+        /// <br/>This function use the password manager to hash the plain text password.
+        /// </summary>
+        /// <param name="mail">The user's mail address.</param>
+        /// <param name="password">The user's plain text password.</param>
+        /// <param name="name">The user's name.</param>
+        /// <param name="surname">The user's surname.</param>
+        /// <param name="profilePict">The user's profile picture.</param>
+        /// <returns>A new user.</returns>
+        User CreateUser(string mail, string password,
+                        string? name = null, string? surname = null, string? profilePict = null);
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="user"></param>
+        /// <returns></returns>
         bool AddUserToData(User user);
         bool ModifyCurrentConnected(User newUser);
         bool LogIn(string mail, string password);