diff --git a/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/BuildLogic.cs b/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/BuildLogic.cs
new file mode 100644
index 0000000..49a2435
--- /dev/null
+++ b/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/BuildLogic.cs
@@ -0,0 +1,120 @@
+using HardwareShopContracts.BindingModels;
+using HardwareShopContracts.SearchModels;
+using HardwareShopContracts.StoragesContracts;
+using HardwareShopContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace HardwareShopContracts.BusinessLogicsContracts
+{
+    public class BuildLogic : IBuildLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IBuildStorage _buildStorage;
+        public BuildLogic(ILogger<BuildLogic> logger, IBuildStorage buildStorage)
+        {
+            _logger = logger;
+            _buildStorage = buildStorage;
+        }
+
+        public List<BuildViewModel>? ReadList(BuildSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. BuildName:{BuildName}. Id:{Id}", model?.BuildName, model?.Id);
+            var list = model == null ? _buildStorage.GetFullList() : _buildStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public BuildViewModel? ReadElement(BuildSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. BuildName:{BuildName}. Id:{Id}", model.BuildName, model.Id);
+            var element = _buildStorage.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(BuildBindingModel model)
+        {
+            CheckModel(model);
+            if (_buildStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(BuildBindingModel model)
+        {
+            CheckModel(model);
+            if (_buildStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(BuildBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_buildStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(BuildBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.BuildName))
+            {
+                throw new ArgumentNullException("Нет названия сборки", nameof(model.BuildName));
+            }
+            if (model.Price <= 0)
+            {
+                throw new ArgumentNullException("Цена компонента должна быть больше 0", nameof(model.Price));
+            }
+            if (model.UserId < 0)
+            {
+                throw new ArgumentNullException("Некорректный идентификатор у клиента", nameof(model.UserId));
+            }
+            if (model.Id < 0)
+            {
+                throw new ArgumentNullException("Некорректный идентификатор у сборки", nameof(model.Id));
+            }
+            _logger.LogInformation("Build. BuildName:{BuildName}. Price:{Price}. Id:{Id}", model.BuildName, model.Price, model.Id);
+            var element = _buildStorage.GetElement(new BuildSearchModel
+            {
+                BuildName = model.BuildName
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Продукт с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/CommentLogic.cs b/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/CommentLogic.cs
new file mode 100644
index 0000000..4d4a130
--- /dev/null
+++ b/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/CommentLogic.cs
@@ -0,0 +1,107 @@
+using HardwareShopContracts.BindingModels;
+using HardwareShopContracts.SearchModels;
+using HardwareShopContracts.StoragesContracts;
+using HardwareShopContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace HardwareShopContracts.BusinessLogicsContracts
+{
+    public class CommentLogic : ICommentLogic
+    {
+        private readonly ILogger _logger;
+        private readonly ICommentStorage _commentStorage;
+        public CommentLogic(ILogger<CommentLogic> logger, ICommentStorage commentStorage)
+        {
+            _logger = logger;
+            _commentStorage = commentStorage;
+        }
+
+        public List<CommentViewModel>? ReadList(CommentSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. BuildId:{BuildId}. Id:{Id}", model?.BuildId, model?.Id);
+            var list = model == null ? _commentStorage.GetFullList() : _commentStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public CommentViewModel? ReadElement(CommentSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. BuildId:{BuildId}. Id:{Id}", model.BuildId, model.Id);
+            var element = _commentStorage.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(CommentBindingModel model)
+        {
+            CheckModel(model);
+            if (_commentStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(CommentBindingModel model)
+        {
+            CheckModel(model);
+            if (_commentStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        public bool Delete(CommentBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_commentStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(CommentBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Text))
+            {
+                throw new ArgumentNullException("Нет текста у комментария", nameof(model.Id));
+            }
+            if (model.BuildId < 0)
+            {
+                throw new ArgumentNullException("Некорректный идентификатор у сборки", nameof(model.BuildId));
+            }
+            if (model.Id < 0)
+            {
+                throw new ArgumentNullException("Некорректный идентификатор у комментария", nameof(model.Id));
+            }
+
+            _logger.LogInformation("Comment. BuildId:{BuildId}. Id:{Id}", model.BuildId, model.Id);
+        }
+    }
+}
\ No newline at end of file
diff --git a/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/PurchaseLogic.cs b/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/PurchaseLogic.cs
new file mode 100644
index 0000000..7aa764f
--- /dev/null
+++ b/HardwareShop/HardwareShopBusinessLogic/BusinessLogics/Worker/PurchaseLogic.cs
@@ -0,0 +1,127 @@
+using HardwareShopContracts.BindingModels;
+using HardwareShopContracts.SearchModels;
+using HardwareShopContracts.StoragesContracts;
+using HardwareShopContracts.ViewModels;
+using HardwareShopDataModels.Enums;
+using Microsoft.Extensions.Logging;
+
+namespace HardwareShopContracts.BusinessLogicsContracts
+{
+    public class PurchaseLogic : IPurchaseLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IPurchaseStorage _purchaseStorage;
+        public PurchaseLogic(ILogger<PurchaseLogic> logger, IPurchaseStorage purchaseStorage)
+        {
+            _logger = logger;
+            _purchaseStorage = purchaseStorage;
+        }
+
+        public List<PurchaseViewModel>? ReadList(PurchaseSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
+            var list = model == null ? _purchaseStorage.GetFullList() : _purchaseStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public CommentViewModel? ReadElement(CommentSearchModel model)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool DeliveryPurchase(PurchaseBindingModel model)
+        {
+            var viewModel = _purchaseStorage.GetElement(new PurchaseSearchModel { Id = model.Id });
+            if (viewModel == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (viewModel.PurchaseStatus + 1 != PurchaseStatus.Выдан)
+            {
+                _logger.LogWarning("Change status operation failed");
+                return false;
+            }
+            model.PurchaseStatus = PurchaseStatus.Выдан;
+            model.DatePurchase = DateTime.Now;
+            CheckModel(model, false);
+            if (_purchaseStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Change status operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Create(PurchaseBindingModel model)
+        {
+            CheckModel(model);
+            if (model.PurchaseStatus != PurchaseStatus.Неизвестен)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            model.PurchaseStatus = PurchaseStatus.Выполняется;
+            if (_purchaseStorage.Insert(model) == null)
+            {
+                model.PurchaseStatus = PurchaseStatus.Неизвестен;
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(PurchaseBindingModel model)
+        {
+            CheckModel(model);
+            if (_purchaseStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(PurchaseBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_purchaseStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(PurchaseBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (model.Id < 0)
+            {
+                throw new ArgumentNullException("Некорректный идентификатор у продукта", nameof(model.Id));
+            }
+            if (model.UserId < 0)
+            {
+                throw new ArgumentNullException("Некорректный идентификатор у клиента", nameof(model.UserId));
+            }
+            if (model.Sum <= 0)
+            {
+                throw new ArgumentNullException("Сумма заказа должна быть больше 0", nameof(model.Sum));
+            }
+            _logger.LogInformation("Purchase. PurchaseID:{Id}. Sum:{ Sum}", model.Id, model.Sum);
+        }
+    }
+}
diff --git a/HardwareShop/HardwareShopBusinessLogic/HardwareShopBusinessLogic.csproj b/HardwareShop/HardwareShopBusinessLogic/HardwareShopBusinessLogic.csproj
index 957eaa4..b47f27c 100644
--- a/HardwareShop/HardwareShopBusinessLogic/HardwareShopBusinessLogic.csproj
+++ b/HardwareShop/HardwareShopBusinessLogic/HardwareShopBusinessLogic.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
@@ -8,7 +8,14 @@
 
   <ItemGroup>
     <Folder Include="BusinessLogics\Storekeeper\" />
-    <Folder Include="BusinessLogics\Worker\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\HardwareShopContracts\HardwareShopContracts.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/HardwareShop/HardwareShopContracts/BuisnessLogicsContracts/IPurchaseLogic.cs b/HardwareShop/HardwareShopContracts/BuisnessLogicsContracts/IPurchaseLogic.cs
index f1ca0da..0882fad 100644
--- a/HardwareShop/HardwareShopContracts/BuisnessLogicsContracts/IPurchaseLogic.cs
+++ b/HardwareShop/HardwareShopContracts/BuisnessLogicsContracts/IPurchaseLogic.cs
@@ -7,7 +7,10 @@ namespace HardwareShopContracts.BusinessLogicsContracts
     public interface IPurchaseLogic
     {
         List<PurchaseViewModel>? ReadList(PurchaseSearchModel? model);
-        bool CreatePurchase(PurchaseBindingModel model);
+        CommentViewModel? ReadElement(CommentSearchModel model);
+        bool Create(PurchaseBindingModel model);
+        bool Update(PurchaseBindingModel model);
+        bool Delete(PurchaseBindingModel model);
         bool DeliveryPurchase(PurchaseBindingModel model);
     }
 }