diff --git a/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/BuildLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/BuildLogic.cs
new file mode 100644
index 0000000..1e4064b
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/BuildLogic.cs
@@ -0,0 +1,113 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.BusinessLogicsContracts;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.StorageContracts;
+using ComputerHardwareStoreContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace ComputerHardwareStoreBusinessLogic.BusinessLogic
+{
+    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 Build. Name:{Name}. Id:{ Id}", model?.Name, model?.Id);
+            var list = model == null ? _buildStorage.GetFullList() :
+                _buildStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList Build return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList Build. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public BuildViewModel? ReadElement(BuildSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement Build. Name:{Name}. Id:{ Id}", model.Name, model.Id);
+            var element = _buildStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement Build element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement Build find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public bool Create(BuildBindingModel model)
+        {
+            CheckModel(model);
+            if (_buildStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert Build operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(BuildBindingModel model)
+        {
+            CheckModel(model);
+            if (_buildStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update Build 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 Build 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.Name))
+            {
+                throw new ArgumentNullException("Нет названия сборки", nameof(model.Name));
+            }
+            if (model.Price <= 0)
+            {
+                throw new ArgumentNullException("Цена сборки должна быть больше 0", nameof(model.Price));
+            }
+            var element = _buildStorage.GetElement(new BuildSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null)
+            {
+                throw new InvalidOperationException("Сборка с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/CommentLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/CommentLogic.cs
new file mode 100644
index 0000000..6764089
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/CommentLogic.cs
@@ -0,0 +1,101 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.BusinessLogicsContracts;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.StorageContracts;
+using ComputerHardwareStoreContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace ComputerHardwareStoreBusinessLogic.BusinessLogic
+{
+    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 Comment. Date:{Date}. Id:{Id}", model?.Date, model?.Id);
+            var list = model == null ? _commentStorage.GetFullList() :
+                _commentStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList Comment return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList Comment. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public CommentViewModel? ReadElement(CommentSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement Comment. Date:{Date}. Id:{ Id}", model.Date, model.Id);
+            var element = _commentStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement Comment element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement Comment find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public bool Create(CommentBindingModel model)
+        {
+            CheckModel(model);
+            if (_commentStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert Comment operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(CommentBindingModel model)
+        {
+            CheckModel(model);
+            if (_commentStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update Comment 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 Comment 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.Date))
+            {
+                throw new ArgumentNullException("Нет даты у комментария", nameof(model.Date));
+            }
+        }
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/PurchaseLogic.cs b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/PurchaseLogic.cs
new file mode 100644
index 0000000..ce693a0
--- /dev/null
+++ b/ComputerHardwareStore/ComputerHardwareStoreBusinessLogic/BusinessLogic/PurchaseLogic.cs
@@ -0,0 +1,105 @@
+using ComputerHardwareStoreContracts.BindingModels;
+using ComputerHardwareStoreContracts.BusinessLogicsContracts;
+using ComputerHardwareStoreContracts.SearchModels;
+using ComputerHardwareStoreContracts.StorageContracts;
+using ComputerHardwareStoreContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace ComputerHardwareStoreBusinessLogic.BusinessLogic
+{
+    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 Purchase. Id:{ Id}", model?.Id);
+            var list = model == null ? _purchaseStorage.GetFullList() :
+                _purchaseStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList Purchase return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList Purchase. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public PurchaseViewModel? ReadElement(PurchaseSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement Purchase. Id:{ Id}", model.Id);
+            var element = _purchaseStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement Purchase element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement Purchase find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public bool Create(PurchaseBindingModel model)
+        {
+            CheckModel(model);
+            if (_purchaseStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert Purchase operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(PurchaseBindingModel model)
+        {
+            CheckModel(model);
+            if (_purchaseStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update Purchase 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 Purchase 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 (string.IsNullOrEmpty(model.DateCreate))
+            {
+                throw new ArgumentNullException("Нет даты создания покупки", nameof(model.Date));
+            }
+            if (model.Cost <= 0)
+            {
+                throw new ArgumentNullException("Стоимость покупки должна быть больше 0", nameof(model.Cost));
+            }
+        }
+    }
+}
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/BindingModels/PurchaseBindingModel.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/BindingModels/PurchaseBindingModel.cs
index 1e27ca0..af08205 100644
--- a/ComputerHardwareStore/ComputerHardwareStoreContracts/BindingModels/PurchaseBindingModel.cs
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/BindingModels/PurchaseBindingModel.cs
@@ -5,10 +5,9 @@ namespace ComputerHardwareStoreContracts.BindingModels
     public class PurchaseBindingModel : IPurchaseModel
     {
         public int Id { get; set; }
+        public int VendorId { get; set; }
         public double Cost { get; set; }
         public DateTime DateCreate { get; set; }
-        public int VendorId { get; set; }
-        public double Sum { get; set; }
         public Dictionary<int, (IBuildModel, int)> PurchaseBuild { get; set; } = new();
         public Dictionary<int, (IProductModel, int)> PurchaseProduct { get; set; } = new();
     }
diff --git a/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/BuildSearchModel.cs b/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/BuildSearchModel.cs
index 3ad2c4a..49022a5 100644
--- a/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/BuildSearchModel.cs
+++ b/ComputerHardwareStore/ComputerHardwareStoreContracts/SearchModels/BuildSearchModel.cs
@@ -3,6 +3,6 @@
     public class BuildSearchModel
     {
         public int? Id { get; set; }
-        public string? BuildName { get; set; }
+        public string? Name { get; set; }
     }
 }
diff --git a/ComputerHardwareStore/ComputerHardwareStoreDataModels/Models/IPurchaseModel.cs b/ComputerHardwareStore/ComputerHardwareStoreDataModels/Models/IPurchaseModel.cs
index 9e8ffb6..9afa7b6 100644
--- a/ComputerHardwareStore/ComputerHardwareStoreDataModels/Models/IPurchaseModel.cs
+++ b/ComputerHardwareStore/ComputerHardwareStoreDataModels/Models/IPurchaseModel.cs
@@ -2,10 +2,9 @@
 {
     public interface IPurchaseModel : IId
     {
+        int VendorId { get; }
         double Cost { get; }
         DateTime DateCreate { get; }
-        int VendorId { get; }
-        double Sum { get; }
         public Dictionary<int, (IBuildModel, int)> PurchaseBuild { get; }
         public Dictionary<int, (IProductModel, int)> PurchaseProduct { get; }
     }