diff --git a/BankYouBankrupt/BankYouBankruptBusinessLogic/BankYouBankruptBusinessLogic.csproj b/BankYouBankrupt/BankYouBankruptBusinessLogic/BankYouBankruptBusinessLogic.csproj
index 2c8a8de..2c9b0c4 100644
--- a/BankYouBankrupt/BankYouBankruptBusinessLogic/BankYouBankruptBusinessLogic.csproj
+++ b/BankYouBankrupt/BankYouBankruptBusinessLogic/BankYouBankruptBusinessLogic.csproj
@@ -12,4 +12,12 @@
     <Folder Include="OfficePackage\" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="7.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\BankYouBankruptContracts\BankYouBankruptContracts.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/BankYouBankrupt/BankYouBankruptBusinessLogic/BusinessLogics/ClientLogic.cs b/BankYouBankrupt/BankYouBankruptBusinessLogic/BusinessLogics/ClientLogic.cs
new file mode 100644
index 0000000..466d0f7
--- /dev/null
+++ b/BankYouBankrupt/BankYouBankruptBusinessLogic/BusinessLogics/ClientLogic.cs
@@ -0,0 +1,123 @@
+using Microsoft.Extensions.Logging;
+using BankYouBankruptContracts.BindingModels;
+using BankYouBankruptContracts.BusinessLogicsContracts;
+using BankYouBankruptContracts.SearchModels;
+using BankYouBankruptContracts.StoragesContracts;
+using BankYouBankruptContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BankYouBankruptBusinessLogic.BusinessLogics
+{
+    public class ClientLogic : IClientLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IClientStorage _clientStorage;
+
+        public ClientLogic(ILogger<ClientLogic> logger, IClientStorage clientStorage) {
+            _logger = logger;
+            _clientStorage = clientStorage;
+        }
+
+        public bool Create(ClientBindingModel model)
+        {
+            CheckModel(model);
+            if (_clientStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ClientBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_clientStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ClientViewModel? ReadElement(ClientSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. ClientFio:{ClientFio}.Id:{ Id}", model.ClientFIO, model.Id);
+            var element = _clientStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<ClientViewModel>? ReadList(ClientSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. ClientId:{Id}", model?.Id);
+            var list = model == null ? _clientStorage.GetFullList() : _clientStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ClientBindingModel model)
+        {
+            CheckModel(model);
+            if (_clientStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ClientBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.ClientFIO))
+            {
+                throw new ArgumentNullException("Нет ФИО пользователя", nameof(model.ClientFIO));
+            }
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                throw new ArgumentNullException("Нет почты пользователя", nameof(model.Email));
+            }
+            if (string.IsNullOrEmpty(model.Password))
+            {
+                throw new ArgumentNullException("Нет пароля пользователя", nameof(model.Password));
+            }
+            _logger.LogInformation("Client. ClientFIO:{ClientFIO}.Email:{Email}.Password:{Password}.Id:{Id}",
+                model.ClientFIO, model.Email, model.Password, model.Id);
+            var element = _clientStorage.GetElement(new ClientSearchModel
+            {
+                ClientFIO = model.ClientFIO
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Клиент с таким именем уже есть");
+            }
+        }
+    }
+}