diff --git a/src/CalculateurMoyanne/BSN/Bussness.csproj b/src/CalculateurMoyanne/BSN/Bussness.csproj
new file mode 100644
index 0000000..ef6377b
--- /dev/null
+++ b/src/CalculateurMoyanne/BSN/Bussness.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <Platforms>AnyCPU;x64</Platforms>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ClassCalculateurMoyenne\ClassCalculateurMoyenne.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/CalculateurMoyanne/BSN/IDataManager.cs b/src/CalculateurMoyanne/BSN/IDataManager.cs
new file mode 100644
index 0000000..757c9c0
--- /dev/null
+++ b/src/CalculateurMoyanne/BSN/IDataManager.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BSN
+{
+    public interface IDataManager<Data>
+    {
+        Task<bool> Add(Data data);
+        Task<bool> Delete(Data data);
+        Task<bool> Update(Data data);
+        Task<Data> GetDataWithName(string name);
+        Task<IEnumerable<Data>> GetAll();
+    }
+}
diff --git a/src/CalculateurMoyanne/BSN/Manager.cs b/src/CalculateurMoyanne/BSN/Manager.cs
new file mode 100644
index 0000000..5008a0e
--- /dev/null
+++ b/src/CalculateurMoyanne/BSN/Manager.cs
@@ -0,0 +1,112 @@
+using ClassCalculateurMoyenne;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BSN
+{
+    public class Manager
+    {
+     #region propriétés
+        public ReadOnlyCollection<MaquetteModel> maquette { get; private set; }
+        private readonly List<MaquetteModel> maquettes = new();
+        public ReadOnlyCollection<BlocModel> bloc { get; private set; }
+        private readonly List<BlocModel> blocs = new();
+        public ReadOnlyCollection<UE> ue { get; private set; }
+        private readonly List<UE> ues = new();
+        public ReadOnlyCollection<Matiere> matiere { get; private set; }
+        private readonly List<Matiere> matieres = new();
+
+
+
+        public IDataManager<MaquetteModel> MaquetteDbDataManager => maquetteDbDataManager;
+        private readonly IDataManager<MaquetteModel> maquetteDbDataManager;
+        public IDataManager<BlocModel> BlocDbDataManager => blocDbDataManager;
+        private readonly IDataManager<BlocModel> blocDbDataManager;
+        public IDataManager<UE> UeDbDataManager => ueDbDataManager;
+        private readonly IDataManager<UE> ueDbDataManager;
+        public IDataManager<Matiere> MatiereDbDataManager => matiereDbDataManager;
+        private readonly IDataManager<Matiere> matiereDbDataManager;
+       
+     #endregion
+
+
+     #region Constructeurs
+
+        public Manager(IDataManager<MaquetteModel> maquettemanager)
+        {
+           this.maquetteDbDataManager = maquettemanager;
+            maquette = new ReadOnlyCollection<MaquetteModel>(maquettes);
+        }
+        public Manager(IDataManager<BlocModel>blocmanager)
+        {
+            this.blocDbDataManager = blocmanager;
+              bloc = new ReadOnlyCollection<BlocModel>(blocs);
+        }
+        public Manager(IDataManager<UE> UeManager)
+        {
+            this.ueDbDataManager = UeManager;
+            ue = new ReadOnlyCollection<UE>(ues);
+        }
+        public Manager(IDataManager<Matiere> matiereDbDataManager)
+        {
+            this.matiereDbDataManager = matiereDbDataManager;
+            matiere = new ReadOnlyCollection<Matiere>(matieres);
+        }
+
+        public Manager(IDataManager<Matiere> matiereManager,IDataManager<UE> UeManager, IDataManager<BlocModel> blocmanager, IDataManager<MaquetteModel> maquettemanager)
+        {
+        this.matiereDbDataManager = matiereManager;
+        matiere = new ReadOnlyCollection<Matiere>(matieres);
+        this.maquetteDbDataManager = maquettemanager;
+        maquette = new ReadOnlyCollection<MaquetteModel>(maquettes);
+        this.blocDbDataManager = blocmanager;
+        bloc = new ReadOnlyCollection<BlocModel>(blocs);
+        this.ueDbDataManager = UeManager;
+        ue = new ReadOnlyCollection<UE>(ues);
+        }
+
+     #endregion
+
+     #region Methodes
+    
+       public Task<bool> AddMaquette(MaquetteModel maqt)
+       {
+        if (maquetteDbDataManager == null)
+        {
+               return Task.FromResult(false);
+        }
+         
+            return maquetteDbDataManager.Add(maqt);
+
+       }
+
+        public async Task<bool> Deletemqt(MaquetteModel maqt)
+        {
+          if (maquetteDbDataManager == null)
+          {
+               return false;
+          }
+            return await maquetteDbDataManager.Delete(maqt);
+        }
+
+        public async Task<bool> UpdateMaquette(MaquetteModel maqt)
+        {
+            if (maquetteDbDataManager == null)
+            {
+                return false;
+            }
+            return await maquetteDbDataManager.Update(maqt);
+        }
+        public async Task<IEnumerable<MaquetteModel>> GetAllMaquette()
+        {
+            return await maquetteDbDataManager.GetAll();
+        }
+
+
+    }
+    #endregion
+}