diff --git a/PapaCarloProject/PapaCarloBusinessLogic/Implementations/BlankBusinessLogicContract.cs b/PapaCarloProject/PapaCarloBusinessLogic/Implementations/BlankBusinessLogicContract.cs
index ec3e9de..9c3bda8 100644
--- a/PapaCarloProject/PapaCarloBusinessLogic/Implementations/BlankBusinessLogicContract.cs
+++ b/PapaCarloProject/PapaCarloBusinessLogic/Implementations/BlankBusinessLogicContract.cs
@@ -1,37 +1,71 @@
-using PapaCarloContracts.BusinessLogicContracts;
+using Microsoft.Extensions.Logging;
+using PapaCarloContracts.BusinessLogicContracts;
 using PapaCarloContracts.DataModels;
+using PapaCarloContracts.Exceptions;
+using PapaCarloContracts.Extensions;
 using PapaCarloContracts.StoragesContracts;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.Json;
 using System.Threading.Tasks;
 
 namespace PapaCarloBusinessLogic.Implementations
 {
-    internal class BlankBusinessLogicContract(IBlankStorageContract storageContract) : IBlankBusinessLogicContract
+    internal class BlankBusinessLogicContract(IBlankStorageContract blankStorageContract, ILogger logger) : IBlankBusinessLogicContract
     {
-        private IBlankStorageContract _storageContract = storageContract;
+        private readonly ILogger _logger = logger;
+        private IBlankStorageContract _blankStorageContract = blankStorageContract;
+
         public void DeleteBlank(string id)
         {
+            _logger.LogInformation("Delete by id: {id}", id);
+            if (id.IsEmpty())
+            {
+                throw new ArgumentNullException(nameof(id));
+            }
+            if (!id.IsGuid())
+            {
+                throw new ValidationException("Id is not a unique identifier");
+            }
+            _blankStorageContract.DelElement(id);
         }
 
         public List<BlankDataModel> GetAllBlanks()
         {
-            return [];
+            _logger.LogInformation("GetAllBlanks");
+            return _blankStorageContract.GetList() ?? throw new NullListException();
         }
 
         public BlankDataModel GetBlankByData(string data)
         {
-            return new("", "", "", "");
+            _logger.LogInformation("Get element by data {data}", data);
+            if (data.IsEmpty())
+            {
+                throw new ArgumentNullException(nameof(data));
+            }
+            if (data.IsGuid())
+            {
+                return _blankStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+            }
+            return _blankStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
         }
 
         public void InsertBlank(BlankDataModel blankDataModel)
         {
+            _logger.LogInformation("New data:{json}", JsonSerializer.Serialize(blankDataModel));
+            ArgumentNullException.ThrowIfNull(blankDataModel);
+            blankDataModel.Validate();
+            _blankStorageContract.AddElement(blankDataModel);
         }
 
         public void UpdateBlank(BlankDataModel blankDataModel)
         {
+            _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(blankDataModel));
+            ArgumentNullException.ThrowIfNull(blankDataModel);
+            blankDataModel.Validate();
+            _blankStorageContract.UpdElement(blankDataModel);
 
         }
     }
diff --git a/PapaCarloProject/PapaCarloBusinessLogic/PapaCarloBusinessLogic.csproj b/PapaCarloProject/PapaCarloBusinessLogic/PapaCarloBusinessLogic.csproj
index 16e76b6..047805f 100644
--- a/PapaCarloProject/PapaCarloBusinessLogic/PapaCarloBusinessLogic.csproj
+++ b/PapaCarloProject/PapaCarloBusinessLogic/PapaCarloBusinessLogic.csproj
@@ -10,6 +10,10 @@
     <InternalsVisibleTo Include="PapaCarloTests" />
     <InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
 </ItemGroup>
+    
+<ItemGroup>
+  <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.2" />
+</ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\PapaCarloContracts\PapaCarloContracts.csproj" />
diff --git a/PapaCarloProject/PapaCarloTests/BusinessLogicsContracts/BlankBusinessLogicContractTests.cs b/PapaCarloProject/PapaCarloTests/BusinessLogicsContracts/BlankBusinessLogicContractTests.cs
index 7012bab..bb37f0c 100644
--- a/PapaCarloProject/PapaCarloTests/BusinessLogicsContracts/BlankBusinessLogicContractTests.cs
+++ b/PapaCarloProject/PapaCarloTests/BusinessLogicsContracts/BlankBusinessLogicContractTests.cs
@@ -1,4 +1,6 @@
-using Moq;
+
+using Microsoft.Extensions.Logging;
+using Moq;
 using NUnit.Framework;
 using PapaCarloBusinessLogic.Implementations;
 using PapaCarloContracts.BusinessLogicContracts;
@@ -16,14 +18,15 @@ namespace PapaCarloTests.BusinessLogicsContracts;
 [TestFixture]
 internal class BlankBusinessLogicContractTests
 {
-    private IBlankBusinessLogicContract _blankBusinessLogicContract;
+    private BlankBusinessLogicContract _blankBusinessLogicContract;
     private Mock<IBlankStorageContract> _blankStorageContract;
 
     [OneTimeSetUp]
     public void OneTimeSetUp()
     {
         _blankStorageContract = new Mock<IBlankStorageContract>();
-        _blankBusinessLogicContract = new BlankBusinessLogicContract(_blankStorageContract.Object);
+        _blankBusinessLogicContract = new BlankBusinessLogicContract(_blankStorageContract.Object, new Mock<ILogger>().Object);
+        
     }
 
     [SetUp]
@@ -221,7 +224,7 @@ internal class BlankBusinessLogicContractTests
     {
         _blankStorageContract.Setup(x => x.UpdElement(It.IsAny<BlankDataModel>())).Throws(new ElementExistsException("Data","Data"));
 
-        Assert.That(() => _blankBusinessLogicContract.UpdateBlank(new(Guid.NewGuid().ToString(), "Spruce", "", "")), Throws.TypeOf<ElementNotFoundException>());
+        Assert.That(() => _blankBusinessLogicContract.UpdateBlank(new(Guid.NewGuid().ToString(), "Spruce", "", "")), Throws.TypeOf<ElementExistsException>());
         _blankStorageContract.Verify(x => x.UpdElement(It.IsAny<BlankDataModel>()), Times.Once);
     }
     [Test]