diff --git a/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/StoreKeeperLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/StoreKeeperLogic.cs
new file mode 100644
index 0000000..aa056f6
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/StoreKeeperLogic.cs
@@ -0,0 +1,107 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.BusinessLogicsContracts;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.StorageContracts;
+using ComputerHardwareStoreContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace ComputerHardwareStoreBusinessLogic.BusinessLogic
+{
+    public class StoreKeeperLogic : IStoreKeeperLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IStoreKeeperStorage _storeKeeperStorage;
+        public StoreKeeperLogic(ILogger<StoreKeeperLogic> logger, IStoreKeeperStorage storeKeeperStorage)
+        {
+            _logger = logger;
+            _storeKeeperStorage = storeKeeperStorage;
+        }
+        public List<StoreKeeperViewModel>? ReadList(StoreKeeperSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Login:{Login}.Id:{Id}", model?.Login, model?.Id);
+            var list = model == null ? _storeKeeperStorage.GetFullList() : _storeKeeperStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public StoreKeeperViewModel? ReadElement(StoreKeeperSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Login:{Login}.Id:{Id}", model.Login, model.Id);
+            var element = _storeKeeperStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public bool Create(StoreKeeperBindingModel model)
+        {
+            CheckModel(model);
+            if (_storeKeeperStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(StoreKeeperBindingModel model)
+        {
+            CheckModel(model);
+            if (_storeKeeperStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(StoreKeeperBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_storeKeeperStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(StoreKeeperBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Login))
+            {
+                throw new ArgumentNullException("Нет логина кладовщика", nameof(model.Login));
+            }
+            var element = _storeKeeperStorage.GetElement(new StoreKeeperSearchModel
+            {
+                Login = model.Login
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Кладовщик с таким логином уже есть");
+            }
+        }
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/VendorLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/VendorLogic.cs
new file mode 100644
index 0000000..449400c
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/VendorLogic.cs
@@ -0,0 +1,107 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.BusinessLogicsContracts;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.StorageContracts;
+using ComputerHardwareStoreContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace ComputerHardwareStoreBusinessLogic.BusinessLogic
+{
+    public class VendorLogic : IVendorLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IVendorStorage _vendorStorage;
+        public VendorLogic(ILogger<VendorLogic> logger, IVendorStorage vendorStorage)
+        {
+            _logger = logger;
+            _vendorStorage = vendorStorage;
+        }
+        public List<VendorViewModel>? ReadList(VendorSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Login:{Login}.Id:{Id}", model?.Login, model?.Id);
+            var list = model == null ? _vendorStorage.GetFullList() : _vendorStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public VendorViewModel? ReadElement(VendorSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Login:{Login}.Id:{Id}", model.Login, model.Id);
+            var element = _vendorStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public bool Create(VendorBindingModel model)
+        {
+            CheckModel(model);
+            if (_vendorStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(VendorBindingModel model)
+        {
+            CheckModel(model);
+            if (_vendorStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(VendorBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_vendorStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(VendorBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Login))
+            {
+                throw new ArgumentNullException("Нет логина работника", nameof(model.Login));
+            }
+            var element = _vendorStorage.GetElement(new VendorSearchModel
+            {
+                Login = model.Login
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Работник с таким логином уже есть");
+            }
+        }
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/StoreKeeperSearchModel.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/StoreKeeperSearchModel.cs
index e069ba1..ed748fe 100644
--- a/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/StoreKeeperSearchModel.cs
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/StoreKeeperSearchModel.cs
@@ -3,7 +3,7 @@
     public class StoreKeeperSearchModel
     {
         public int? Id { get; set; }
-        public string? Email { get; set; }
+        public string? Login { get; set; }
         public string? Password { get; set; }
     }
 }
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/VendorSearchModel.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/VendorSearchModel.cs
index f15394a..fc54068 100644
--- a/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/VendorSearchModel.cs
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/VendorSearchModel.cs
@@ -3,7 +3,7 @@
     public class VendorSearchModel
     {
         public int? Id { get; set; }
-        public string? Email { get; set; }
+        public string? Login { get; set; }
         public string? Password { get; set; }
     }
 }