diff --git a/LivreLand.sln b/LivreLand.sln
index 104fd74..9e8b91f 100644
--- a/LivreLand.sln
+++ b/LivreLand.sln
@@ -4,8 +4,13 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 VisualStudioVersion = 17.0.31611.283
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LivreLand", "LivreLand\LivreLand.csproj", "{0E95A11F-0D16-4CC3-82CD-E3BE44C28B2B}"
+	ProjectSection(ProjectDependencies) = postProject
+		{7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E} = {7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E}
+	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Model", "Model\Model.csproj", "{7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Model", "Model\Model.csproj", "{7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ViewModels", "ViewModels\ViewModels.csproj", "{72B707A3-3797-4F15-80BC-9D5ECA7B67EE}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -23,6 +28,10 @@ Global
 		{7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7DB41B43-9DAA-48C8-8D41-EF2F06FDD33E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{72B707A3-3797-4F15-80BC-9D5ECA7B67EE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{72B707A3-3797-4F15-80BC-9D5ECA7B67EE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{72B707A3-3797-4F15-80BC-9D5ECA7B67EE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{72B707A3-3797-4F15-80BC-9D5ECA7B67EE}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/LivreLand/LivreLand.csproj b/LivreLand/LivreLand.csproj
index 0380f02..29bc9f7 100644
--- a/LivreLand/LivreLand.csproj
+++ b/LivreLand/LivreLand.csproj
@@ -78,6 +78,9 @@
 	  <MauiXaml Update="View\ContentViews\PopupHomePlusButtonView.xaml">
 	    <Generator>MSBuild:Compile</Generator>
 	  </MauiXaml>
+	  <MauiXaml Update="View\ContentViews\PopupISBNView.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </MauiXaml>
 	  <MauiXaml Update="View\ContentViews\PopupLetterView.xaml">
 	    <Generator>MSBuild:Compile</Generator>
 	  </MauiXaml>
diff --git a/LivreLand/MauiProgram.cs b/LivreLand/MauiProgram.cs
index e3fe3ab..071a52d 100644
--- a/LivreLand/MauiProgram.cs
+++ b/LivreLand/MauiProgram.cs
@@ -23,8 +23,10 @@ public static class MauiProgram
 			.AddSingleton<NavigatorVM>()
 			.AddSingleton<BibliothequeView>();
 
+        //Ajouter des Singletons <ILibraryManager, LibraryStub>, Manager et ManagerVm
+
 #if DEBUG
-		builder.Logging.AddDebug();
+        builder.Logging.AddDebug();
 #endif
 
 		return builder.Build();
diff --git a/LivreLand/View/BibliothequeView.xaml b/LivreLand/View/BibliothequeView.xaml
index f63ff8d..e8a4ca0 100644
--- a/LivreLand/View/BibliothequeView.xaml
+++ b/LivreLand/View/BibliothequeView.xaml
@@ -22,7 +22,8 @@
             <RowDefinition Height="*"/>
         </Grid.RowDefinitions>
         
-        <view:HeaderHome Grid.Row="0"/>
+        <view:HeaderHome Grid.Row="0"
+                         ButtonTappedCommand="{Binding Navigator.PopupHomePlusNavigationCommand}"/>
         <ScrollView Grid.Row="2">
             <Grid>
                 <Grid.RowDefinitions>
diff --git a/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml b/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml
index e3c7480..cf9db6a 100644
--- a/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml
+++ b/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml
@@ -118,6 +118,9 @@
                     </Image.Behaviors>
                 </Image>
             </Grid>
+            <Grid.GestureRecognizers>
+                <TapGestureRecognizer Command="{Binding Navigator.PopupISBNNavigationCommand}"/>
+            </Grid.GestureRecognizers>
         </Grid>
         <Border.StrokeShape>
             <RoundRectangle CornerRadius="10" />
diff --git a/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml.cs b/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml.cs
index 11b931d..8fe2889 100644
--- a/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml.cs
+++ b/LivreLand/View/ContentViews/PopupHomePlusButtonView.xaml.cs
@@ -1,12 +1,27 @@
 using CommunityToolkit.Maui.Views;
+using LivreLand.ViewModel;
 
 namespace LivreLand.View.ContentViews;
 
 public partial class PopupHomePlusButtonView : Popup
 {
-	public PopupHomePlusButtonView()
+
+    #region Properties
+
+    public NavigatorVM Navigator { get; private set; }
+
+    #endregion
+
+
+    #region Constructor
+
+    public PopupHomePlusButtonView(NavigatorVM navigatorVM)
 	{
-		InitializeComponent();
+        Navigator = navigatorVM;
+        InitializeComponent();
 		Size = new Size(0.8 * (DeviceDisplay.Current.MainDisplayInfo.Width / DeviceDisplay.Current.MainDisplayInfo.Density), 0.5 * (DeviceDisplay.Current.MainDisplayInfo.Width / DeviceDisplay.Current.MainDisplayInfo.Density));
-	}
+        BindingContext = this;
+    }
+
+    #endregion
 }
\ No newline at end of file
diff --git a/LivreLand/View/ContentViews/PopupISBNView.xaml b/LivreLand/View/ContentViews/PopupISBNView.xaml
new file mode 100644
index 0000000..4190417
--- /dev/null
+++ b/LivreLand/View/ContentViews/PopupISBNView.xaml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<toolkit:Popup xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+               xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+               xmlns:contentView="clr-namespace:LivreLand.View.ContentViews"
+               xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
+               x:Class="LivreLand.View.ContentViews.PopupISBNView"
+               HorizontalOptions="Center"
+               VerticalOptions="Center"
+               Color="Transparent">
+
+    <Border>
+        <Grid BackgroundColor="{AppThemeBinding Light={StaticResource PopupBackground}, Dark={StaticResource Black}}">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="auto"/>
+                <RowDefinition Height="auto"/>
+            </Grid.RowDefinitions>
+
+            <Grid Grid.Row="0"
+                  Margin="5">
+                <Label Text="Saisir l'ISBN"
+                       Style="{StaticResource MasterStateBookText}"/>
+            </Grid>
+
+            <Grid Grid.Row="1"
+                  Margin="5">
+                <Entry />
+            </Grid>
+        </Grid>
+        <Border.StrokeShape>
+            <RoundRectangle CornerRadius="10" />
+        </Border.StrokeShape>
+    </Border>
+
+</toolkit:Popup>
diff --git a/LivreLand/View/ContentViews/PopupISBNView.xaml.cs b/LivreLand/View/ContentViews/PopupISBNView.xaml.cs
new file mode 100644
index 0000000..75a9dac
--- /dev/null
+++ b/LivreLand/View/ContentViews/PopupISBNView.xaml.cs
@@ -0,0 +1,12 @@
+using CommunityToolkit.Maui.Views;
+
+namespace LivreLand.View.ContentViews;
+
+public partial class PopupISBNView : Popup
+{
+	public PopupISBNView()
+	{
+		InitializeComponent();
+        Size = new Size(0.8 * (DeviceDisplay.Current.MainDisplayInfo.Width / DeviceDisplay.Current.MainDisplayInfo.Density), 0.5 * (DeviceDisplay.Current.MainDisplayInfo.Width / DeviceDisplay.Current.MainDisplayInfo.Density));
+    }
+}
\ No newline at end of file
diff --git a/LivreLand/View/HeaderHome.xaml b/LivreLand/View/HeaderHome.xaml
index c7b9740..4b31410 100644
--- a/LivreLand/View/HeaderHome.xaml
+++ b/LivreLand/View/HeaderHome.xaml
@@ -2,9 +2,11 @@
 <ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
-             x:Class="LivreLand.View.HeaderHome">
+             x:Class="LivreLand.View.HeaderHome"
+             x:Name="this">
 
-    <Grid ColumnDefinitions="auto, *, auto"
+    <Grid BindingContext="{x:Reference this}"
+          ColumnDefinitions="auto, *, auto"
           Margin="5">
         <Grid>
             <Label Text="Modifier"
@@ -18,8 +20,8 @@
                      BackgroundColor="Transparent"
                      MaximumHeightRequest="20"
                      MaximumWidthRequest="20"
-                     Clicked="OnPlusClicked"
-                     Grid.Column="2">
+                     Grid.Column="2"
+                     Command="{Binding ButtonTappedCommand}">
             <ImageButton.Behaviors>
                 <toolkit:IconTintColorBehavior TintColor="{StaticResource PinkOrange}"/>
             </ImageButton.Behaviors>
diff --git a/LivreLand/View/HeaderHome.xaml.cs b/LivreLand/View/HeaderHome.xaml.cs
index 1d484e1..14b01c3 100644
--- a/LivreLand/View/HeaderHome.xaml.cs
+++ b/LivreLand/View/HeaderHome.xaml.cs
@@ -1,18 +1,30 @@
-using CommunityToolkit.Maui.Views;
-using LivreLand.View.ContentViews;
+using LivreLand.ViewModel;
+using System.Windows.Input;
 
 namespace LivreLand.View;
 
 public partial class HeaderHome : ContentView
 {
-	public HeaderHome()
-	{
-		InitializeComponent();
-	}
 
-    public void OnPlusClicked(object sender, EventArgs e)
+    #region Properties
+
+    public NavigatorVM Navigator { get; private set; }
+
+    public static readonly BindableProperty ButtonTappedCommandProperty = BindableProperty.Create(nameof(ButtonTappedCommand), typeof(ICommand), typeof(HeaderPage));
+    public ICommand ButtonTappedCommand
     {
-        var plusPopup = new PopupHomePlusButtonView();
-        App.Current.MainPage.ShowPopup(plusPopup);
+        get { return (ICommand)GetValue(ButtonTappedCommandProperty); }
+        set { SetValue(ButtonTappedCommandProperty, value); }
     }
+
+    #endregion
+
+    #region Constructor
+
+    public HeaderHome()
+	{
+        InitializeComponent();
+    }
+
+    #endregion
 }
\ No newline at end of file
diff --git a/LivreLand/View/HeaderPage.xaml b/LivreLand/View/HeaderPage.xaml
index 36f45b5..150765f 100644
--- a/LivreLand/View/HeaderPage.xaml
+++ b/LivreLand/View/HeaderPage.xaml
@@ -4,10 +4,10 @@
              xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
              x:Class="LivreLand.View.HeaderPage"
              x:Name="this"
-             BindingContext="{x:Reference this}"
              BackgroundColor="{AppThemeBinding Light={Binding HeaderColor}, Dark={StaticResource Black}}">
-    
-    <Grid Margin="5">
+
+    <Grid BindingContext="{x:Reference this}"
+          Margin="5">
         <Grid>  
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="auto"/>
@@ -40,7 +40,7 @@
                        Style="{StaticResource HeaderTitle}"
                        Grid.Column="2"/>
                 <Grid.GestureRecognizers>
-                    <TapGestureRecognizer Tapped="OnBackButtonTapped"/>
+                    <TapGestureRecognizer Command="{Binding PopupBackButtonNavigationCommand}"/>
                 </Grid.GestureRecognizers>
             </Grid>
             <ImageButton VerticalOptions="Center"
@@ -49,7 +49,7 @@
                          MaximumHeightRequest="20"
                          MaximumWidthRequest="20"
                          IsVisible="{Binding HeaderPlusButtonVisible}"
-                         Clicked="OnPlusClicked"
+                         Command="{Binding ButtonTappedCommand}"
                          Grid.Column="2">
                 <ImageButton.Behaviors>
                     <toolkit:IconTintColorBehavior TintColor="{StaticResource PinkOrange}"/>
diff --git a/LivreLand/View/HeaderPage.xaml.cs b/LivreLand/View/HeaderPage.xaml.cs
index db61ef9..0dfb0ac 100644
--- a/LivreLand/View/HeaderPage.xaml.cs
+++ b/LivreLand/View/HeaderPage.xaml.cs
@@ -2,11 +2,18 @@ using LivreLand.View.ContentViews;
 using Microsoft.Maui.ApplicationModel;
 using Microsoft.Maui.Graphics;
 using CommunityToolkit.Maui.Views;
+using System.Windows.Input;
+using LivreLand.ViewModel;
 
 namespace LivreLand.View;
 
 public partial class HeaderPage : ContentView
 {
+
+    #region Properties
+
+    public NavigatorVM Navigator { get; private set; }
+
     public static readonly BindableProperty HeaderTitleProperty = BindableProperty.Create(nameof(HeaderTitle), typeof(string), typeof(HeaderPage), string.Empty);
     public string HeaderTitle
     {
@@ -42,19 +49,29 @@ public partial class HeaderPage : ContentView
         set => SetValue(HeaderPage.HeaderColorProperty, value);
     }
 
+    public static readonly BindableProperty ButtonPlusTappedCommandProperty = BindableProperty.Create(nameof(ButtonPlusTappedCommand), typeof(ICommand), typeof(HeaderPage));
+    public ICommand ButtonPlusTappedCommand
+    {
+        get { return (ICommand)GetValue(ButtonPlusTappedCommandProperty); }
+        set { SetValue(ButtonPlusTappedCommandProperty, value); }
+    }
+
+    public static readonly BindableProperty ButtonBackTappedCommandProperty = BindableProperty.Create(nameof(ButtonBackTappedCommand), typeof(ICommand), typeof(HeaderPage));
+    public ICommand ButtonBackTappedCommand
+    {
+        get { return (ICommand)GetValue(ButtonBackTappedCommandProperty); }
+        set { SetValue(ButtonBackTappedCommandProperty, value); }
+    }
+
+    #endregion
+
+    #region Constructor
+
     public HeaderPage()
 	{
 		InitializeComponent();
 	}
 
-    public void OnBackButtonTapped(object sender, EventArgs e)
-    {
-        App.Current.MainPage.Navigation.PopAsync();
-    }
+    #endregion
 
-    public void OnPlusClicked(object sender, EventArgs e)
-    {
-        var plusPopup = new PopupHomePlusButtonView();
-        App.Current.MainPage.ShowPopup(plusPopup);
-    }
 }
\ No newline at end of file
diff --git a/LivreLand/View/TousView.xaml b/LivreLand/View/TousView.xaml
index 2d923c8..029ff27 100644
--- a/LivreLand/View/TousView.xaml
+++ b/LivreLand/View/TousView.xaml
@@ -3,8 +3,13 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:view="clr-namespace:LivreLand.View"
              xmlns:contentView="clr-namespace:LivreLand.View.ContentViews"
+             xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
              x:Class="LivreLand.View.TousView"
              Title="TousView">
+
+    <!--<ContentPage.Behaviors>
+        <toolkit:EventToCommandBehavior />
+    </ContentPage.Behaviors>-->
     
     <Grid>
         <Grid.RowDefinitions>
@@ -17,7 +22,9 @@
                          HeaderBackButtonText="Mes livres"
                          HeaderPlusButtonVisible="True"
                          HeaderSwitchButtonVisible="True"
-                         Grid.Row="0"/>
+                         Grid.Row="0"
+                         ButtonPlusTappedCommand="{Binding Navigator.PopupHomePlusNavigationCommand}"
+                         ButtonBackTappedCommand="{Binding Navigator.PopupBackButtonNavigationCommand}"/>
         <ScrollView Grid.Row="2">
             <Grid>
                 <Grid.RowDefinitions>
@@ -44,7 +51,6 @@
                 </Grid>
                 <CollectionView ItemsSource="{Binding DamasioBooks}"
                                 SelectionMode="Single"
-                                SelectionChanged="OnSelectionChanged"
                                 Grid.Row="2">
                     <CollectionView.ItemTemplate>
                         <DataTemplate>
diff --git a/LivreLand/ViewModel/BookVM.cs b/LivreLand/ViewModel/BookVM.cs
new file mode 100644
index 0000000..a5f4280
--- /dev/null
+++ b/LivreLand/ViewModel/BookVM.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LivreLand.ViewModel
+{
+    class BookVM
+    {
+        //public Book Model
+        //{
+        //    get => model;
+        //    set => model = value;
+        //}
+        //private Book model;
+
+        //public BookVM()
+        //{
+        //    Model = model;
+        //}
+
+        //public string Title
+        //{
+        //    get => model.Title;
+        //    set
+        //    {
+        //        model.Title = value;
+        //    }
+        //}
+    }
+}
diff --git a/LivreLand/ViewModel/NavigatorVM.cs b/LivreLand/ViewModel/NavigatorVM.cs
index 8858fe4..63c8b9e 100644
--- a/LivreLand/ViewModel/NavigatorVM.cs
+++ b/LivreLand/ViewModel/NavigatorVM.cs
@@ -1,4 +1,6 @@
-using LivreLand.View;
+using CommunityToolkit.Maui.Views;
+using LivreLand.View;
+using LivreLand.View.ContentViews;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -21,6 +23,9 @@ namespace LivreLand.ViewModel
         public ICommand AuteurNavigationCommand { get; }
         public ICommand DatePublicationNavigationCommand { get; }
         public ICommand NoteNavigationCommand { get; }
+        public ICommand PopupHomePlusNavigationCommand { get; }
+        public ICommand PopupISBNNavigationCommand { get; }
+        public ICommand PopupBackButtonNavigationCommand { get; }
 
         #endregion
 
@@ -36,6 +41,9 @@ namespace LivreLand.ViewModel
             AuteurNavigationCommand = new Command(() => Navigator.PushAsync(new FiltrageAuteurView()));
             DatePublicationNavigationCommand = new Command(() => Navigator.PushAsync(new FiltrageDateView()));
             NoteNavigationCommand = new Command(() => Navigator.PushAsync(new FiltrageNoteView()));
+            PopupHomePlusNavigationCommand = new Command(() => App.Current.MainPage.ShowPopup(new PopupHomePlusButtonView(this)));
+            PopupISBNNavigationCommand = new Command(() => App.Current.MainPage.ShowPopup(new PopupISBNView()));
+            PopupBackButtonNavigationCommand = new Command(() => App.Current.MainPage.Navigation.PopAsync());
         }
 
         #endregion
diff --git a/ViewModels/ManagerVM.cs b/ViewModels/ManagerVM.cs
new file mode 100644
index 0000000..bf83cf4
--- /dev/null
+++ b/ViewModels/ManagerVM.cs
@@ -0,0 +1,23 @@
+using System.Windows.Input;
+
+namespace ViewModels
+{
+    public class ManagerVM
+    {
+        //public Manager Model
+        //{
+        //    get => model;
+        //    private set => model = value;
+        //}
+        //private Manager model;
+
+        //public ICommand GetBooksByTitleCommand;
+
+        //public ManagerVM(Manager model)
+        //{
+        //    Model = model;
+        //    GetBooksByTitleCommand = new Command(async () =>
+        //    )
+        //}
+    }
+}
\ No newline at end of file
diff --git a/ViewModels/ViewModels.csproj b/ViewModels/ViewModels.csproj
new file mode 100644
index 0000000..cfadb03
--- /dev/null
+++ b/ViewModels/ViewModels.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>