diff --git a/Webzine.WebApplication/Areas/Administration/ViewModels/DashboardViewModel.cs b/Webzine.Business.Contracts/Dto/DashboardDTO.cs
similarity index 90%
rename from Webzine.WebApplication/Areas/Administration/ViewModels/DashboardViewModel.cs
rename to Webzine.Business.Contracts/Dto/DashboardDTO.cs
index 106779d..9509c6c 100644
--- a/Webzine.WebApplication/Areas/Administration/ViewModels/DashboardViewModel.cs
+++ b/Webzine.Business.Contracts/Dto/DashboardDTO.cs
@@ -1,9 +1,9 @@
-namespace Webzine.WebApplication.Areas.Administration.ViewModels;
+namespace Webzine.Business.Contracts.Dto;
 
 /// <summary>
-/// ViewModel pour le tableau de bord de l'administration du webzine.
+/// DTO pour le tableau de bord de l'administration du webzine.
 /// </summary>
-public class DashboardViewModel
+public class DashboardDTO
 {
     /// <summary>
     /// Définit le nombre total d'artistes chroniqués dans le webzine.
diff --git a/Webzine.Business.Contracts/IDashboardService.cs b/Webzine.Business.Contracts/IDashboardService.cs
new file mode 100644
index 0000000..8bde456
--- /dev/null
+++ b/Webzine.Business.Contracts/IDashboardService.cs
@@ -0,0 +1,16 @@
+using Webzine.Business.Contracts.Dto;
+
+namespace Webzine.Business.Contracts;
+
+/// <summary>
+/// Service responsable du calcul des statistiques affichées sur le tableau de bord d'administration.
+/// Agrège les données provenant de plusieurs repositories pour produire un résumé cohérent.
+/// </summary>
+public interface IDashboardService
+{
+    /// <summary>
+    /// Calcule et retourne toutes les statistiques du tableau de bord en une seule passe.
+    /// </summary>
+    /// <returns>Un <see cref="DashboardDTO"/> contenant les agrégats calculés.</returns>
+    DashboardDTO GetDashboardData();
+}
\ No newline at end of file
diff --git a/Webzine.Business/DashboardService.cs b/Webzine.Business/DashboardService.cs
new file mode 100644
index 0000000..d9e9812
--- /dev/null
+++ b/Webzine.Business/DashboardService.cs
@@ -0,0 +1,71 @@
+using Webzine.Business.Contracts;
+using Webzine.Entity;
+using Webzine.Repository.Contracts;
+
+namespace Webzine.Business;
+
+using Contracts.Dto;
+
+/// <summary>
+/// Implémentation de <see cref="IDashboardService"/>.
+/// Orchestre plusieurs appels aux repositories pour produire les statistiques du tableau de bord.
+/// </summary>
+public class DashboardService : IDashboardService
+{
+    private readonly IArtisteRepository artisteRepository;
+    private readonly ITitreRepository titreRepository;
+    private readonly IStyleRepository styleRepository;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DashboardService"/> class.
+    /// </summary>
+    /// <param name="artisteRepository">Repository des artistes.</param>
+    /// <param name="titreRepository">Repository des titres.</param>
+    /// <param name="styleRepository">Repository des styles.</param>
+    public DashboardService(
+        IArtisteRepository artisteRepository,
+        ITitreRepository titreRepository,
+        IStyleRepository styleRepository)
+    {
+        this.artisteRepository = artisteRepository;
+        this.titreRepository = titreRepository;
+        this.styleRepository = styleRepository;
+    }
+
+    /// <inheritdoc/>
+    public DashboardDTO GetDashboardData()
+    {
+        IEnumerable<Titre> titres = this.titreRepository.FindAll();
+
+        Artiste? artisteLePlusChronique = titres
+            .GroupBy(t => t.Artiste)
+            .OrderByDescending(g => g.Count())
+            .FirstOrDefault()
+            ?.Key;
+
+        Artiste? albumLePlusChronique = titres
+            .GroupBy(t => (t.Artiste, t.Album))
+            .GroupBy(g => g.Key.Artiste)
+            .OrderByDescending(g => g.Count())
+            .FirstOrDefault()
+            ?.Key;
+
+        Titre? musiqueLaPlusJouee = titres
+            .OrderByDescending(t => t.NbLectures)
+            .FirstOrDefault();
+
+        return new DashboardDTO
+        {
+            NombreArtistes = this.artisteRepository.Count(),
+            ArtisteLePlusChronique = artisteLePlusChronique.Nom,
+            AlbumLePlusChronique = albumLePlusChronique.Nom,
+            NombreBiographies = this.artisteRepository.Count(a => !string.IsNullOrEmpty(a.Biographie)),
+            IdMusiqueLaPlusJouee = musiqueLaPlusJouee.IdTitre,
+            MusiqueLaPlusJouee = musiqueLaPlusJouee.Libelle,
+            NombreTitres = this.titreRepository.Count(),
+            NombreGenres = this.styleRepository.Count(),
+            NombreLectures = titres.Sum(t => t.NbLectures),
+            NombreLikes = titres.Sum(t => t.NbLikes),
+        };
+    }
+}
\ No newline at end of file
diff --git a/Webzine.Business/Webzine.Business.csproj b/Webzine.Business/Webzine.Business.csproj
index 33c0658..6e5a6aa 100644
--- a/Webzine.Business/Webzine.Business.csproj
+++ b/Webzine.Business/Webzine.Business.csproj
@@ -21,4 +21,9 @@
       </Content>
     </ItemGroup>
 
+    <ItemGroup>
+      <ProjectReference Include="..\Webzine.Business.Contracts\Webzine.Business.Contracts.csproj" />
+      <ProjectReference Include="..\Webzine.Repository.Contracts\Webzine.Repository.Contracts.csproj" />
+    </ItemGroup>
+
 </Project>
diff --git a/Webzine.Repository.Contracts/IArtisteRepository.cs b/Webzine.Repository.Contracts/IArtisteRepository.cs
index bc13f76..ee170b5 100644
--- a/Webzine.Repository.Contracts/IArtisteRepository.cs
+++ b/Webzine.Repository.Contracts/IArtisteRepository.cs
@@ -51,5 +51,18 @@ namespace Webzine.Repository.Contracts
         /// <param name="nom">Nom de l'artiste.</param>
         /// <returns>IEnumarble.<Artiste> qui contient la chaine de caractere.</returns>
         IEnumerable<Artiste> Search(string nom);
+
+        /// <summary>
+        /// Récupère le nombre total d'artistes dans la collection.
+        /// </summary>
+        /// <returns>Le nombre total d'artistes.</returns>
+        int Count();
+
+        /// <summary>
+        /// Récupère le nombre d'artistes correspondant au prédicat fourni.
+        /// </summary>
+        /// <param name="predicate">Le prédicat de filtrage.</param>
+        /// <returns>Le nombre d'artistes correspondants.</returns>
+        int Count(Func<Artiste, bool> predicate);
     }
 }
\ No newline at end of file
diff --git a/Webzine.Repository.Contracts/IStyleRepository.cs b/Webzine.Repository.Contracts/IStyleRepository.cs
index d260039..0ea9ba3 100644
--- a/Webzine.Repository.Contracts/IStyleRepository.cs
+++ b/Webzine.Repository.Contracts/IStyleRepository.cs
@@ -37,5 +37,11 @@ namespace Webzine.Repository.Contracts
         /// </summary>
         /// <param name="style">L'objet style à mettre à jour.</param
         void Update(Style style);
+
+        /// <summary>
+        /// Récupère le nombre total de styles dans la liste des styles.
+        /// </summary>
+        /// <returns>Le nombre total de styles présents dans la liste.</returns>
+        int Count();
     }
 }
\ No newline at end of file
diff --git a/Webzine.Repository/DbArtisteRepository.cs b/Webzine.Repository/DbArtisteRepository.cs
index c27c1d7..0b3748f 100644
--- a/Webzine.Repository/DbArtisteRepository.cs
+++ b/Webzine.Repository/DbArtisteRepository.cs
@@ -176,5 +176,37 @@ namespace Webzine.Repository
                 throw new Exception("Erreur lors de la recherche d'artiste {error}", ex);
             }
         }
+
+        /// <inheritdoc/>
+        public int Count()
+        {
+            try
+            {
+                int count = this.context.Artistes.Count();
+                this.logger.LogDebug("Nombre total d'artistes dans la base: {Count}", count);
+                return count;
+            }
+            catch (Exception ex)
+            {
+                this.logger.LogError(ex, "Erreur lors du comptage des artistes.");
+                throw;
+            }
+        }
+
+        /// <inheritdoc/>
+        public int Count(Func<Artiste, bool> predicate)
+        {
+            try
+            {
+                int count = this.context.Artistes.Count(predicate);
+                this.logger.LogDebug("Nombre d'artistes (avec prédicat): {Count}", count);
+                return count;
+            }
+            catch (Exception ex)
+            {
+                this.logger.LogError(ex, "Erreur lors du comptage des artistes avec prédicat.");
+                throw;
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/Webzine.Repository/DbStyleRepository.cs b/Webzine.Repository/DbStyleRepository.cs
index c350a4f..0a6894b 100644
--- a/Webzine.Repository/DbStyleRepository.cs
+++ b/Webzine.Repository/DbStyleRepository.cs
@@ -178,4 +178,20 @@ public class DbStyleRepository : IStyleRepository
             throw;
         }
     }
+
+    /// <inheritdoc/>
+    public int Count()
+    {
+        try
+        {
+            int count = this.context.Styles.Count();
+            this.logger.LogDebug("Nombre total de styles: {Count}", count);
+            return count;
+        }
+        catch (Exception ex)
+        {
+            this.logger.LogError(ex, "Erreur lors du comptage des styles");
+            throw;
+        }
+    }
 }
\ No newline at end of file
diff --git a/Webzine.Repository/LocalArtisteRepository.cs b/Webzine.Repository/LocalArtisteRepository.cs
index 69021c5..0388da3 100644
--- a/Webzine.Repository/LocalArtisteRepository.cs
+++ b/Webzine.Repository/LocalArtisteRepository.cs
@@ -93,5 +93,17 @@ namespace Webzine.Repository
                 .Where(a => a.Nom.ToLower().Contains(mot.ToLower()))
                 .ToList();
         }
+
+        /// <inheritdoc/>
+        public int Count()
+        {
+            return this.dataStore.Artistes.Count;
+        }
+
+        /// <inheritdoc/>
+        public int Count(Func<Artiste, bool> predicate)
+        {
+            return this.dataStore.Artistes.Count(predicate);
+        }
     }
 }
\ No newline at end of file
diff --git a/Webzine.Repository/LocalStyleRepository.cs b/Webzine.Repository/LocalStyleRepository.cs
index 0b4d16c..e750ff2 100644
--- a/Webzine.Repository/LocalStyleRepository.cs
+++ b/Webzine.Repository/LocalStyleRepository.cs
@@ -56,4 +56,10 @@ public class LocalStyleRepository : IStyleRepository
     {
         throw new NotSupportedException("Mode local");
     }
+
+    /// <inheritdoc/>
+    public int Count()
+    {
+        return this.dataStore.Styles.Count;
+    }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/Controllers/DashboardController.cs b/Webzine.WebApplication/Areas/Administration/Controllers/DashboardController.cs
index 2f314ad..97f1721 100644
--- a/Webzine.WebApplication/Areas/Administration/Controllers/DashboardController.cs
+++ b/Webzine.WebApplication/Areas/Administration/Controllers/DashboardController.cs
@@ -1,30 +1,26 @@
 namespace Webzine.WebApplication.Areas.Administration.Controllers;
 
+using Webzine.Business.Contracts;
+using Webzine.Business.Contracts.Dto;
 using Microsoft.AspNetCore.Mvc;
-
 using Webzine.Repository.Contracts;
-using Webzine.WebApplication.Areas.Administration.ViewModels;
 
 [Area("Administration")]
 public class DashboardController : Controller
 {
     private readonly ILogger<DashboardController> logger;
-    private readonly IStyleRepository styleRepository;
-    private readonly IArtisteRepository artisteRepository;
-    private readonly ITitreRepository titreRepository;
+    private readonly IDashboardService dashboardService;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="DashboardController"/> class.
     /// Initialise une nouvelle instance de la classe <see cref="DashboardController"/>.
     /// </summary>
     /// <param name="logger">Service de journalisation injecté.</param>
-    /// <param name="styleRepository">Repository des styles injecté.</param>
-    public DashboardController(ILogger<DashboardController> logger, IStyleRepository styleRepository, IArtisteRepository artisteRepository, ITitreRepository titreRepository)
+    /// <param name="dashboardService">Service de calcul des statistiques du tableau de bord.</param>
+    public DashboardController(ILogger<DashboardController> logger, IDashboardService dashboardService)
     {
         this.logger = logger;
-        this.styleRepository = styleRepository;
-        this.artisteRepository = artisteRepository;
-        this.titreRepository = titreRepository;
+        this.dashboardService = dashboardService;
 
         this.logger.LogInformation("Initialisation du contrôleur TitreController.");
     }
@@ -35,42 +31,8 @@ public class DashboardController : Controller
     /// <returns>La vue Index du tableau de bord.</returns>
     public IActionResult Index()
     {
-        var artisteLePlusChronique = this.titreRepository.FindAll()
-            .GroupBy(t => t.Artiste)
-            .OrderByDescending(g => g.Count())
-            .First();
+        DashboardDTO data = dashboardService.GetDashboardData();
 
-        var albumLePlusChronique = this.titreRepository.FindAll()
-            .GroupBy(t => t.Artiste)
-            .OrderByDescending(g => g.Select(t => t.Album).Distinct().Count())
-            .First();
-
-        var musiqueLaPlusJouee = this.titreRepository.FindAll()
-            .OrderByDescending(t => t.NbLectures)
-            .First();
-
-        var model = new DashboardViewModel
-        {
-            NombreArtistes = this.artisteRepository.FindAll().Count(),
-
-            ArtisteLePlusChronique = artisteLePlusChronique.Key.Nom,
-
-            AlbumLePlusChronique = albumLePlusChronique.Key.Nom,
-
-            NombreBiographies = this.artisteRepository.FindAll().Count(a => !string.IsNullOrEmpty(a.Biographie)),
-
-            IdMusiqueLaPlusJouee = musiqueLaPlusJouee.IdTitre,
-            MusiqueLaPlusJouee = musiqueLaPlusJouee.Libelle,
-
-            NombreTitres = this.titreRepository.Count(),
-
-            NombreGenres = this.styleRepository.FindAll().Count(),
-
-            NombreLectures = this.titreRepository.FindAll().Sum(t => t.NbLectures),
-
-            NombreLikes = this.titreRepository.FindAll().Sum(t => t.NbLikes),
-        };
-
-        return this.View(model);
+        return this.View(data);
     }
 }
\ No newline at end of file
diff --git a/Webzine.WebApplication/Areas/Administration/Views/Dashboard/Index.cshtml b/Webzine.WebApplication/Areas/Administration/Views/Dashboard/Index.cshtml
index ac676f2..65217be 100644
--- a/Webzine.WebApplication/Areas/Administration/Views/Dashboard/Index.cshtml
+++ b/Webzine.WebApplication/Areas/Administration/Views/Dashboard/Index.cshtml
@@ -1,4 +1,5 @@
-@model Webzine.WebApplication.Areas.Administration.ViewModels.DashboardViewModel
+@using Webzine.Business.Contracts.Dto
+@model DashboardDTO
 
 <h1 class="mb-4">Tableau de bord</h1>
 
diff --git a/Webzine.WebApplication/Program.cs b/Webzine.WebApplication/Program.cs
index 916d86e..d118c67 100644
--- a/Webzine.WebApplication/Program.cs
+++ b/Webzine.WebApplication/Program.cs
@@ -6,6 +6,8 @@ using Microsoft.EntityFrameworkCore;
 using NLog;
 using NLog.Web;
 
+using Webzine.Business;
+using Webzine.Business.Contracts;
 using Webzine.EntitiesContext;
 using Webzine.Entity;
 using Webzine.Entity.Fixtures;
@@ -67,6 +69,8 @@ try
         builder.Services.AddSingleton<InMemoryDataStore>();
     }
 
+    builder.Services.AddScoped<IDashboardService, DashboardService>();
+
     // https://learn.microsoft.com/fr-fr/aspnet/core/performance/response-compression?view=aspnetcore-10.0#configuration
     // Ajoute le service de compression des réponses HTTP pour réduire la taille des données envoyées au client et améliorer les performances de l'application.
     builder.Services.AddResponseCompression();
@@ -78,6 +82,8 @@ try
         using (var scope = app.Services.CreateScope())
         {
             var db = scope.ServiceProvider.GetRequiredService<WebzineDbContext>();
+            db.Database.EnsureCreated();
+
             if (shouldSeed)
             {
                 db.Database.EnsureDeleted();
diff --git a/Webzine.WebApplication/Webzine.WebApplication.csproj b/Webzine.WebApplication/Webzine.WebApplication.csproj
index f47a272..5f8c0ca 100644
--- a/Webzine.WebApplication/Webzine.WebApplication.csproj
+++ b/Webzine.WebApplication/Webzine.WebApplication.csproj
@@ -34,6 +34,8 @@
     </ItemGroup>
 
     <ItemGroup>
+      <ProjectReference Include="..\Webzine.Business.Contracts\Webzine.Business.Contracts.csproj" />
+      <ProjectReference Include="..\Webzine.Business\Webzine.Business.csproj" />
       <ProjectReference Include="..\Webzine.EntitiesContext\Webzine.EntitiesContext.csproj" />
       <ProjectReference Include="..\Webzine.Entity\Webzine.Entity.csproj" />
       <ProjectReference Include="..\Webzine.Repository\Webzine.Repository.csproj" />