diff --git a/FishFactory/FishFactoryBusinessLogic/BusinessLogic/ClientLogic.cs b/FishFactory/FishFactoryBusinessLogic/BusinessLogic/ClientLogic.cs
new file mode 100644
index 0000000..d438c2e
--- /dev/null
+++ b/FishFactory/FishFactoryBusinessLogic/BusinessLogic/ClientLogic.cs
@@ -0,0 +1,120 @@
+using FishFactoryContracts.BindingModels;
+using FishFactoryContracts.BusinessLogicsContracts;
+using FishFactoryContracts.SearchModels;
+using FishFactoryContracts.StoragesContracts;
+using FishFactoryContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryBusinessLogic.BusinessLogic
+{
+    public class ClientLogic : IClientLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IClientStorage _clientStorage;
+        public ClientLogic(ILogger<ClientLogic> logger, IClientStorage clientStorage)
+        {
+            _logger = logger;
+            _clientStorage = clientStorage;
+        }
+
+        public bool Create(ClientBindingModel model)
+        {
+            CheckModel(model);
+            if (_clientStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ClientBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_clientStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ClientViewModel? ReadElement(ClientSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Email:{Email}.Id:{ Id}",
+                model.Email, model.Id);
+            var element = _clientStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
+            return element;
+        }
+
+        public List<ClientViewModel>? ReadList(ClientSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Email:{Email}.Id:{ Id} ", model?.Email, model?.Id);
+            var list = (model == null) ? _clientStorage.GetFullList() :
+            _clientStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ClientBindingModel model)
+        {
+            CheckModel(model);
+            if (_clientStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ClientBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.ClientFIO))
+            {
+                throw new ArgumentNullException("Нет фио клиента", nameof(model.ClientFIO));
+            }
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                throw new ArgumentNullException("Нет логина клиента", nameof(model.Email));
+            }
+            _logger.LogInformation("Client. Id: {Id}, FIO: {fio}, email: {email}", model.Id, model.ClientFIO, model.Email);
+            var element = _clientStorage.GetElement(new ClientSearchModel
+            {
+                Email = model.Email,
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Клиент с таким логином уже есть");
+            }
+        }
+    }
+}
diff --git a/FishFactory/FishFactoryContracts/BindingModels/ClientBindingModel.cs b/FishFactory/FishFactoryContracts/BindingModels/ClientBindingModel.cs
new file mode 100644
index 0000000..97c6709
--- /dev/null
+++ b/FishFactory/FishFactoryContracts/BindingModels/ClientBindingModel.cs
@@ -0,0 +1,17 @@
+using FishFactoryDataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryContracts.BindingModels
+{
+    public class ClientBindingModel : IClientModel
+    {
+        public int Id { get; set; }
+        public string ClientFIO { get; set; } = string.Empty;
+        public string Email { get; set; } = string.Empty;
+        public string Password { get; set; } = string.Empty;
+    }
+}
diff --git a/FishFactory/FishFactoryContracts/BusinessLogicsContracts/IClientLogic.cs b/FishFactory/FishFactoryContracts/BusinessLogicsContracts/IClientLogic.cs
new file mode 100644
index 0000000..90fad64
--- /dev/null
+++ b/FishFactory/FishFactoryContracts/BusinessLogicsContracts/IClientLogic.cs
@@ -0,0 +1,20 @@
+using FishFactoryContracts.BindingModels;
+using FishFactoryContracts.SearchModels;
+using FishFactoryContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryContracts.BusinessLogicsContracts
+{
+    public interface IClientLogic
+    {
+        List<ClientViewModel>? ReadList(ClientSearchModel? model);
+        ClientViewModel? ReadElement(ClientSearchModel model);
+        bool Create(ClientBindingModel model);
+        bool Update(ClientBindingModel model);
+        bool Delete(ClientBindingModel model);
+    }
+}
diff --git a/FishFactory/FishFactoryContracts/SearchModels/ClientSearchModel.cs b/FishFactory/FishFactoryContracts/SearchModels/ClientSearchModel.cs
new file mode 100644
index 0000000..1b5dd7d
--- /dev/null
+++ b/FishFactory/FishFactoryContracts/SearchModels/ClientSearchModel.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryContracts.SearchModels
+{
+    public class ClientSearchModel
+    {
+        public int? Id { get; set; }
+        public string? ClientFIO { get; set; }
+        public string Email { get; set; }
+        public string Password { get; set; }
+    }
+}
diff --git a/FishFactory/FishFactoryContracts/StoragesContracts/IClientStorage.cs b/FishFactory/FishFactoryContracts/StoragesContracts/IClientStorage.cs
new file mode 100644
index 0000000..06771f1
--- /dev/null
+++ b/FishFactory/FishFactoryContracts/StoragesContracts/IClientStorage.cs
@@ -0,0 +1,21 @@
+using FishFactoryContracts.BindingModels;
+using FishFactoryContracts.SearchModels;
+using FishFactoryContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryContracts.StoragesContracts
+{
+    public interface IClientStorage
+    {
+        List<ClientViewModel> GetFullList();
+        List<ClientViewModel> GetFilteredList(ClientSearchModel model);
+        ClientViewModel? GetElement(ClientSearchModel model);
+        ClientViewModel? Insert(ClientBindingModel model);
+        ClientViewModel? Update(ClientBindingModel model);
+        ClientViewModel? Delete(ClientBindingModel model);
+    }
+}
diff --git a/FishFactory/FishFactoryContracts/ViewModels/ClientViewModel.cs b/FishFactory/FishFactoryContracts/ViewModels/ClientViewModel.cs
new file mode 100644
index 0000000..9737cf0
--- /dev/null
+++ b/FishFactory/FishFactoryContracts/ViewModels/ClientViewModel.cs
@@ -0,0 +1,21 @@
+using FishFactoryDataModels;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryContracts.ViewModels
+{
+    public class ClientViewModel : IClientModel
+    {
+        public int Id { get; set; }
+        [DisplayName("ФИО клиента")]
+        public string ClientFIO { get; set; } = string.Empty;
+        [DisplayName("Логин (эл. почта)")]
+        public string Email { get; set; } = string.Empty;
+        [DisplayName("Пароль")]
+        public string Password { get; set; } = string.Empty;
+    }
+}
diff --git a/FishFactory/FishFactoryDataModels/IClientModel.cs b/FishFactory/FishFactoryDataModels/IClientModel.cs
new file mode 100644
index 0000000..1fa77cc
--- /dev/null
+++ b/FishFactory/FishFactoryDataModels/IClientModel.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FishFactoryDataModels
+{
+    public interface IClientModel : IId
+    {
+        string ClientFIO { get; }
+        string Email { get; }
+        string Password { get; }
+    }
+}