diff --git a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/CollectBusinessLogicContract.cs b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/CollectBusinessLogicContract.cs
index f395ef0..c5f2d03 100644
--- a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/CollectBusinessLogicContract.cs
+++ b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/CollectBusinessLogicContract.cs
@@ -1,31 +1,82 @@
-using SoftBedContracts.BusinessLogicsContracts;
+using Microsoft.Extensions.Logging;
+using SoftBedContracts.BusinessLogicsContracts;
 using SoftBedContracts.DataModels;
+using SoftBedContracts.Exceptions;
+using SoftBedContracts.Extensions;
+using SoftBedContracts.StoragesContracts;
+using System.Text.Json;
 
 namespace SoftBedBusinessLogic.Implementations;
 
-internal class CollectBusinessLogicContract : ICollectBusinessLogicContract
+internal class CollectBusinessLogicContract(ICollectStorageContract collectStorageContract, ILogger logger) : ICollectBusinessLogicContract
 {
-    public List<CollectDataModel> GetAllCollectByPeriod(DateTime fromDate, DateTime toDate)
+    private readonly ILogger _logger = logger;
+    private readonly ICollectStorageContract _collectStorageContract = collectStorageContract;
+    public List<CollectDataModel> GetAllCollectsByPeriod(DateTime fromDate, DateTime toDate)
     {
-        return [];
+        _logger.LogInformation("GetAllCollects params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _collectStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
     }
 
-    public List<CollectDataModel> GetAllCollectByWorkerByPeriod(string workerId, DateTime fromDate, DateTime toDate)
+    public List<CollectDataModel> GetAllCollectsByWorkerByPeriod(string workerId, DateTime fromDate, DateTime toDate)
     {
-        return [];
+        _logger.LogInformation("GetAllCollects params: {workerId}, {fromDate}, {toDate}", workerId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (workerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(workerId));
+        }
+        if (!workerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field workerId is not a unique identifier.");
+        }
+        return _collectStorageContract.GetList(fromDate, toDate, workerId: workerId) ?? throw new NullListException();
     }
 
     public List<CollectDataModel> GetAllCollectsByFurnitureByPeriod(string furnitureId, DateTime fromDate, DateTime toDate)
     {
-        return [];
+        _logger.LogInformation("GetAllCollects params: {buyerId}, {fromDate}, {toDate}", furnitureId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (furnitureId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(furnitureId));
+        }
+        if (!furnitureId.IsGuid())
+        {
+            throw new ValidationException("The value in the field buyerId is not a unique identifier.");
+        }
+        return _collectStorageContract.GetList(fromDate, toDate, furnitureId: furnitureId) ?? throw new NullListException();
     }
 
     public CollectDataModel GetCollectByData(string data)
     {
-        return new("", "", "", 0);
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (!data.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        return _collectStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
     }
 
     public void InsertCollect(CollectDataModel collectDataModel)
     {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(collectDataModel));
+        ArgumentNullException.ThrowIfNull(collectDataModel);
+        collectDataModel.Validate();
+        _collectStorageContract.AddElement(collectDataModel);
     }
 }
diff --git a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/FurnitureBusinessLogicContract.cs b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/FurnitureBusinessLogicContract.cs
index 52b730e..4f096b7 100644
--- a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/FurnitureBusinessLogicContract.cs
+++ b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/FurnitureBusinessLogicContract.cs
@@ -1,35 +1,91 @@
-using SoftBedContracts.BusinessLogicsContracts;
+using Microsoft.Extensions.Logging;
+using SoftBedContracts.BusinessLogicsContracts;
 using SoftBedContracts.DataModels;
 using SoftBedContracts.Enums;
+using SoftBedContracts.Exceptions;
+using SoftBedContracts.Extensions;
+using SoftBedContracts.StoragesContracts;
+using System.Text.Json;
 
 namespace SoftBedBusinessLogic.Implementations;
 
-internal class FurnitureBusinessLogicContract : IFurnitureBusinessLogicContract
+internal class FurnitureBusinessLogicContract(IFurnitureStorageContract furnitureStorageContract, ILogger logger) : IFurnitureBusinessLogicContract
 {
-
+    private readonly ILogger _logger = logger;
+    private readonly IFurnitureStorageContract _furnitureStorageContract = furnitureStorageContract;
 
     public List<FurnitureDataModel> GetAllFurniture(bool onlyActive = true)
     {
-        return [];
+        _logger.LogInformation("GetAllFurniture params: {onlyActive}", onlyActive);
+        return _furnitureStorageContract.GetList(onlyActive) ?? throw new NullListException();
+    }
+    public List<FurnitureDataModel> GetAllFurnitureByWorkPieces(string workPiecesId, bool onlyActive = true) 
+    {
+        _logger.LogInformation("GetAllSales params: {workPiecesId}", workPiecesId);
+        if (workPiecesId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(workPiecesId));
+        }
+        if (!workPiecesId.IsGuid())
+        {
+            throw new ValidationException("The value in the field workPiecesId is not a unique identifier.");
+        }
+        return _furnitureStorageContract.GetList(onlyActive, workPiecesId) ?? throw new NullListException();
     }
     public List<FurnitureHistoryDataModel> GetFurnitureHistoryByFurniture(string furnitureId)
     {
-        return [];
+        _logger.LogInformation("GetFurnitureHistoryByFurniture for {furnitureId}", furnitureId);
+        if (furnitureId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(furnitureId));
+        }
+        if (!furnitureId.IsGuid())
+        {
+            throw new ValidationException("The value in the field furnitureId is not a unique identifier.");
+        }
+        return _furnitureStorageContract.GetHistoryByFurnitureId(furnitureId) ?? throw new NullListException();
     }
-
+    
     public FurnitureDataModel GetFurnitureByData(string data)
     {
-        return new("", "", FurnitureType.None, 0, false, []);
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _furnitureStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _furnitureStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
     }
 
     public void InsertFurniture(FurnitureDataModel furnitureDataModel)
     {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(furnitureDataModel));
+        ArgumentNullException.ThrowIfNull(furnitureDataModel);
+        furnitureDataModel.Validate();
+        _furnitureStorageContract.AddElement(furnitureDataModel);
     }
 
     public void UpdateFurniture(FurnitureDataModel furnitureDataModel)
     {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(furnitureDataModel));
+        ArgumentNullException.ThrowIfNull(furnitureDataModel);
+        furnitureDataModel.Validate();
+        _furnitureStorageContract.UpdElement(furnitureDataModel);
     }
     public void DeleteFurniture(string id)
     {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _furnitureStorageContract.DelElement(id);
     }
 }
diff --git a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/PostBusinessLogicContract.cs b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/PostBusinessLogicContract.cs
index f2d4559..a9b44f5 100644
--- a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/PostBusinessLogicContract.cs
+++ b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/PostBusinessLogicContract.cs
@@ -1,40 +1,93 @@
-using SoftBedContracts.BusinessLogicsContracts;
+using Microsoft.Extensions.Logging;
+using SoftBedContracts.BusinessLogicsContracts;
 using SoftBedContracts.DataModels;
-using SoftBedContracts.Enums;
+using SoftBedContracts.Exceptions;
+using SoftBedContracts.Extensions;
+using SoftBedContracts.StoragesContracts;
+using System.Text.Json;
 
 namespace SoftBedBusinessLogic.Implementations;
 
-internal class PostBusinessLogicContract : IPostBusinessLogicContract
+internal class PostBusinessLogicContract(IPostStorageContract postStorageContract, ILogger logger) : IPostBusinessLogicContract
 {
+    private readonly ILogger _logger = logger;
+    private readonly IPostStorageContract _postStorageContract = postStorageContract;
+
+    public List<PostDataModel> GetAllPosts(bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllPosts params: {onlyActive}", onlyActive);
+        return _postStorageContract.GetList(onlyActive) ?? throw new NullListException();
+    }
 
     public List<PostDataModel> GetAllDataOfPost(string postId)
     {
-        return [];
-    }
-
-    public List<PostDataModel> GetAllPosts(bool onlyActive)
-    {
-        return [];
-
+        _logger.LogInformation("GetAllDataOfPost for {postId}", postId);
+        if (postId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(postId));
+        }
+        if (!postId.IsGuid())
+        {
+            throw new ValidationException("The value in the field postId is not a unique identifier.");
+        }
+        return _postStorageContract.GetPostWithHistory(postId) ?? throw new NullListException();
     }
 
     public PostDataModel GetPostByData(string data)
     {
-        return new("", "", PostType.None, 0, true, DateTime.Now);
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _postStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _postStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
     }
 
     public void InsertPost(PostDataModel postDataModel)
     {
-    }
-
-    public void RestorePost(string id)
-    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(postDataModel));
+        ArgumentNullException.ThrowIfNull(postDataModel);
+        postDataModel.Validate();
+        _postStorageContract.AddElement(postDataModel);
     }
 
     public void UpdatePost(PostDataModel postDataModel)
     {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(postDataModel));
+        ArgumentNullException.ThrowIfNull(postDataModel);
+        postDataModel.Validate();
+        _postStorageContract.UpdElement(postDataModel);
     }
+
     public void DeletePost(string id)
     {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _postStorageContract.DelElement(id);
+    }
+
+    public void RestorePost(string id)
+    {
+        _logger.LogInformation("Restore by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _postStorageContract.ResElement(id);
     }
 }
diff --git a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/SalaryBusinessLogicContract.cs b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/SalaryBusinessLogicContract.cs
index def0cac..bf5d0ac 100644
--- a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/SalaryBusinessLogicContract.cs
+++ b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/SalaryBusinessLogicContract.cs
@@ -1,21 +1,64 @@
-using SoftBedContracts.BusinessLogicsContracts;
+using Microsoft.Extensions.Logging;
+using SoftBedContracts.BusinessLogicsContracts;
 using SoftBedContracts.DataModels;
+using SoftBedContracts.Exceptions;
+using SoftBedContracts.Extensions;
+using SoftBedContracts.StoragesContracts;
 
 namespace SoftBedBusinessLogic.Implementations;
 
-internal class SalaryBusinessLogicContract : ISalaryBusinessLogicContract
+internal class SalaryBusinessLogicContract(ISalaryStorageContract salaryStorageContract,
+    ICollectStorageContract collectStorageContract, IPostStorageContract postStorageContract, IWorkerStorageContract workerStorageContract, ILogger logger) : ISalaryBusinessLogicContract
 {
-    public void CalculateSalaryByMonth(DateTime date)
-    {        
-    }
+    private readonly ILogger _logger = logger;
+    private readonly ISalaryStorageContract _salaryStorageContract = salaryStorageContract;
+    private readonly ICollectStorageContract _collectStorageContract = collectStorageContract;
+    private readonly IPostStorageContract _postStorageContract = postStorageContract;
+    private readonly IWorkerStorageContract _workerStorageContract = workerStorageContract;
 
     public List<SalaryDataModel> GetAllSalariesByPeriod(DateTime fromDate, DateTime toDate)
     {
-        return [];
+        _logger.LogInformation("GetAllSalaries params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _salaryStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
     }
 
     public List<SalaryDataModel> GetAllSalariesByPeriodByWorker(DateTime fromDate, DateTime toDate, string workerId)
     {
-        return [];
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (workerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(workerId));
+        }
+        if (!workerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field workerId is not a unique identifier.");
+        }
+        _logger.LogInformation("GetAllSalaries params: {fromDate}, {toDate}, {workerId}", fromDate, toDate, workerId);
+        return _salaryStorageContract.GetList(fromDate, toDate, workerId) ?? throw new NullListException();
     }
-}
+
+    public void CalculateSalaryByMonth(DateTime date)
+    {
+        _logger.LogInformation("CalculateSalaryByMonth: {date}", date);
+        var startDate = new DateTime(date.Year, date.Month, 1);
+        var finishDate = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
+        var workers = _workerStorageContract.GetList() ?? throw new NullListException();
+        foreach (var worker in workers)
+        {
+            var collects = _collectStorageContract.GetList(startDate, finishDate, workerId: worker.Id)?.Sum(x => x.Sum) ??
+                throw new NullListException();
+            var post = _postStorageContract.GetElementById(worker.PostId) ??
+                throw new NullListException();
+            var salary = post.Salary + collects * 0.1;
+            _logger.LogDebug("The employee {workerId} was paid a salary of {salary}", worker.Id, salary);
+            _salaryStorageContract.AddElement(new SalaryDataModel(worker.Id, finishDate, salary));
+        }
+    }
+}
\ No newline at end of file
diff --git a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkPieceBusinessLogicContract.cs b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkPieceBusinessLogicContract.cs
index 75876d6..46fa074 100644
--- a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkPieceBusinessLogicContract.cs
+++ b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkPieceBusinessLogicContract.cs
@@ -1,30 +1,69 @@
-using SoftBedContracts.BusinessLogicsContracts;
+using Microsoft.Extensions.Logging;
+using SoftBedContracts.BusinessLogicsContracts;
 using SoftBedContracts.DataModels;
+using SoftBedContracts.Exceptions;
+using SoftBedContracts.Extensions;
+using SoftBedContracts.StoragesContracts;
+using System.Text.Json;
+using System.Text.RegularExpressions;
 
 namespace SoftBedBusinessLogic.Implementations;
 
-internal class WorkPieceBusinessLogicContract : IWorkPieceBusinessLogicContract
+internal class WorkPieceBusinessLogicContract(IWorkPieceStorageContract workPieceStorageContract, ILogger logger) : IWorkPieceBusinessLogicContract
 {
+    private readonly ILogger _logger = logger;
+    private IWorkPieceStorageContract _workPieceStorageContract = workPieceStorageContract;
 
     public List<WorkPieceDataModel> GetAllWorkPieces()
     {
-        return [];
+        _logger.LogInformation("GetAllWorkPieces");
+        return _workPieceStorageContract.GetList() ?? throw new NullListException();
     }
 
     public WorkPieceDataModel GetWorkPiecesByData(string data)
     {
-        return new("", "", 0);
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _workPieceStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        if (Regex.IsMatch(data, @"^\d+x\d+$"))
+        {
+            return _workPieceStorageContract.GetElementBySize(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _workPieceStorageContract.GetElementBySize(data) ?? throw new ElementNotFoundException(data);
     }
 
-    public void InsertPost(WorkPieceDataModel workPieceDataModel)
+    public void InsertWorkPiece(WorkPieceDataModel workPieceDataModel)
     {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(workPieceDataModel));
+        ArgumentNullException.ThrowIfNull(workPieceDataModel);
+        workPieceDataModel.Validate();
+        _workPieceStorageContract.AddElement(workPieceDataModel);
     }
 
-    public void UpdatePost(WorkPieceDataModel workPieceDataModel)
+    public void UpdateWorkPiece(WorkPieceDataModel workPieceDataModel)
     {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(workPieceDataModel));
+        ArgumentNullException.ThrowIfNull(workPieceDataModel);
+        workPieceDataModel.Validate();
+        _workPieceStorageContract.UpdElement(workPieceDataModel);
     }
-    public void DeletePost(string id)
+    public void DeleteWorkPiece(string id)
     {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _workPieceStorageContract.DelElement(id);
     }
-
 }
diff --git a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkerBusinessLogicContract.cs b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkerBusinessLogicContract.cs
index 71e46ca..9cfa1db 100644
--- a/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkerBusinessLogicContract.cs
+++ b/TheSoftBedProject/SoftBedBusinessLogic/Implementations/WorkerBusinessLogicContract.cs
@@ -1,43 +1,99 @@
-using SoftBedContracts.BusinessLogicsContracts;
+using Microsoft.Extensions.Logging;
+using SoftBedContracts.BusinessLogicsContracts;
 using SoftBedContracts.DataModels;
+using SoftBedContracts.Exceptions;
+using SoftBedContracts.Extensions;
+using SoftBedContracts.StoragesContracts;
+using System.Text.Json;
 
 namespace SoftBedBusinessLogic.Implementations;
 
-internal class WorkerBusinessLogicContract : IWorkerBusinessLogicContract
+internal class WorkerBusinessLogicContract(IWorkerStorageContract workerStorageContract, ILogger logger) : IWorkerBusinessLogicContract
 {
+    private readonly ILogger _logger = logger;
+    private readonly IWorkerStorageContract _workerStorageContract = workerStorageContract;
+
     public List<WorkerDataModel> GetAllWorkers()
     {
-        return [];
-    }
-
-    public List<WorkerDataModel> GetAllWorkersByBirthDate(DateTime fromDate, DateTime toDate)
-    {
-        return [];
-    }
-
-    public List<WorkerDataModel> GetAllWorkersByEmploymentDate(DateTime fromDate, DateTime toDate)
-    {
-        return [];
+        _logger.LogInformation("GetAllWorkers");
+        return _workerStorageContract.GetList() ?? throw new NullListException();
     }
 
     public List<WorkerDataModel> GetAllWorkersByPost(string postId)
     {
-        return [];
+        _logger.LogInformation("GetAllWorkers params: {postId},", postId);
+        if (postId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(postId));
+        }
+        if (!postId.IsGuid())
+        {
+            throw new ValidationException("The value in the field postId is not a unique identifier.");
+        }
+        return _workerStorageContract.GetList(postId) ?? throw new NullListException();
+    }
+
+    public List<WorkerDataModel> GetAllWorkersByBirthDate(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllWorkers params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _workerStorageContract.GetList(fromBirthDate: fromDate, toBirthDate: toDate) ?? throw new NullListException();
+    }
+
+    public List<WorkerDataModel> GetAllWorkersByEmploymentDate(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllWorkers params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _workerStorageContract.GetList(fromEmploymentDate: fromDate, toEmploymentDate: toDate) ?? throw new NullListException();
     }
 
     public WorkerDataModel GetWorkerByData(string data)
     {
-        return new("", "", "", DateTime.Now, DateTime.Now);
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _workerStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _workerStorageContract.GetElementByFIO(data) ?? throw new ElementNotFoundException(data);
     }
 
     public void InsertWorker(WorkerDataModel workerDataModel)
     {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(workerDataModel));
+        ArgumentNullException.ThrowIfNull(workerDataModel);
+        workerDataModel.Validate();
+        _workerStorageContract.AddElement(workerDataModel);
     }
 
     public void UpdateWorker(WorkerDataModel workerDataModel)
     {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(workerDataModel));
+        ArgumentNullException.ThrowIfNull(workerDataModel);
+        workerDataModel.Validate();
+        _workerStorageContract.UpdElement(workerDataModel);
     }
+
     public void DeleteWorker(string id)
     {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _workerStorageContract.DelElement(id);
     }
-}
+}
\ No newline at end of file