diff --git a/STOBusinessLogic/TechnicalWorkLogic.cs b/STOBusinessLogic/TechnicalWorkLogic.cs
new file mode 100644
index 0000000..0f47e3b
--- /dev/null
+++ b/STOBusinessLogic/TechnicalWorkLogic.cs
@@ -0,0 +1,126 @@
+using Microsoft.Extensions.Logging;
+using STOContracts.BindingModels;
+using STOContracts.BusinessLogicsContracts;
+using STOContracts.SearchModels;
+using STOContracts.StoragesContracts;
+using STOContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace STOBusinessLogic
+{
+    public class TechnicalWorkLogic : ITechnicalWorkLogic
+    {
+        private readonly ILogger _logger;
+        private readonly ITechnicalWorkStorage _TechnicalWorkStorage;
+        public TechnicalWorkLogic(ILogger<TechnicalWorkLogic> logger, ITechnicalWorkStorage TechnicalWorkStorage)
+        {
+            _logger = logger;
+            _TechnicalWorkStorage = TechnicalWorkStorage;
+        }
+
+        public List<TechnicalWorkViewModel>? ReadList(TechnicalWorkSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Id:{ Id}", model?.Id);
+            var list = model == null ? _TechnicalWorkStorage.GetFullList() : _TechnicalWorkStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+        public TechnicalWorkViewModel? ReadElement(TechnicalWorkSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement.Id:{ Id}", model.Id);
+            var element = _TechnicalWorkStorage.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(TechnicalWorkBindingModel model)
+        {
+            CheckModel(model);
+            if (_TechnicalWorkStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(TechnicalWorkBindingModel model)
+        {
+            CheckModel(model);
+            if (_TechnicalWorkStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        public bool Delete(TechnicalWorkBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_TechnicalWorkStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(TechnicalWorkBindingModel 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",
+               nameof(model.Name));
+            }
+            if (string.IsNullOrEmpty(model.Description))
+            {
+                throw new ArgumentNullException("Нет описания для ТО",
+               nameof(model.Name));
+            }
+            //по умолчанию если дата не была присвоена вручную то мы ей ставили минимальное значение
+            if (model.Date == DateTime.MinValue)
+            {
+                throw new ArgumentNullException("Нет даты",
+               nameof(model.Date));
+            }
+            _logger.LogInformation("TechnicalWork. Name: {Name}.Id: { Id}", model.Name, model.Id);
+            //имена ТО должны быть уникальными? 
+            var element = _TechnicalWorkStorage.GetElement(new TechnicalWorkSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("ТО с таким названием уже есть");
+            }
+        }
+    }
+}
diff --git a/STOBusinessLogic/WorkLogic.cs b/STOBusinessLogic/WorkLogic.cs
new file mode 100644
index 0000000..8cd25a9
--- /dev/null
+++ b/STOBusinessLogic/WorkLogic.cs
@@ -0,0 +1,101 @@
+using Microsoft.Extensions.Logging;
+using STOContracts.BindingModels;
+using STOContracts.BusinessLogicContracts;
+using STOContracts.SearchModels;
+using STOContracts.StorageContracts;
+using STOContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace STOBusinessLogic
+{
+    public class WorkLogic : IWorkLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IWorkStorage _WorkStorage;
+        public WorkLogic(ILogger<WorkLogic> logger, IWorkStorage WorkStorage)
+        {
+            _logger = logger;
+            _WorkStorage = WorkStorage;
+        }
+
+        public List<WorkViewModel>? ReadList(WorkSearchModel? model)
+        {
+            _logger.LogInformation("ReadList.Id:{ Id}", model?.Id);
+            var list = model == null ? _WorkStorage.GetFullList() : _WorkStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+        public WorkViewModel? ReadElement(WorkSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadList.Id:{ Id}", model.Id);
+            var element = _WorkStorage.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(WorkBindingModel model)
+        {
+            CheckModel(model);
+            if (_WorkStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(WorkBindingModel model)
+        {
+            CheckModel(model);
+            if (_WorkStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        public bool Delete(WorkBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_WorkStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(WorkBindingModel model, bool withParams =
+        true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            _logger.LogInformation("ReadList.Id:{ Id}", model.Id);
+        }
+    }
+}