diff --git a/AbazovApp/AccountsBusinessLogic/AccountsBusinessLogic.csproj b/AbazovApp/AccountsBusinessLogic/AccountsBusinessLogic.csproj
new file mode 100644
index 0000000..fa98651
--- /dev/null
+++ b/AbazovApp/AccountsBusinessLogic/AccountsBusinessLogic.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AccountsContracts\AccountsContracts.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/AbazovApp/AccountsBusinessLogic/BusinessLogics/AccountLogic.cs b/AbazovApp/AccountsBusinessLogic/BusinessLogics/AccountLogic.cs
new file mode 100644
index 0000000..a554301
--- /dev/null
+++ b/AbazovApp/AccountsBusinessLogic/BusinessLogics/AccountLogic.cs
@@ -0,0 +1,100 @@
+using AccountsContracts.BindingModels;
+using AccountsContracts.BusinessLogicContracts;
+using AccountsContracts.SearchModels;
+using AccountsContracts.StorageContracts;
+using AccountsContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AccountsBusinessLogic.BusinessLogics
+{
+    public class AccountLogic : IAccountLogic
+    {
+        private readonly IAccountStorage _accountStorage;
+
+        public AccountLogic(IAccountStorage accountStorage)
+        {
+            _accountStorage = accountStorage;
+        }
+
+        public List<AccountViewModel>? ReadList(AccountSearchModel? model)
+        {
+            var list = model == null ? _accountStorage.GetFullList() : _accountStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                return null;
+            }
+            return list;
+        }
+
+        public AccountViewModel? ReadElement(AccountSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            var element = _accountStorage.GetElement(model);
+            if (element == null)
+            {
+                return null;
+            }
+            return element;
+        }
+
+        public bool Create(AccountBindingModel model)
+        {
+            CheckModel(model);
+            if (_accountStorage.Insert(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(AccountBindingModel model)
+        {
+            CheckModel(model);
+            if (_accountStorage.Update(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+        public bool Delete(AccountBindingModel model)
+        {
+            CheckModel(model, false);
+            if (_accountStorage.Delete(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(AccountBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Login))
+            {
+                throw new ArgumentNullException("Нет логина пользователя", nameof(model.Login));
+            }
+            if (string.IsNullOrEmpty(model.Password))
+            {
+                throw new ArgumentNullException("Нет пароля пользователя", nameof(model.Password));
+            }
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                throw new ArgumentNullException("Нет электронной почты пользователя", nameof(model.Email));
+            }
+        }
+    }
+}
diff --git a/AbazovApp/AccountsBusinessLogic/BusinessLogics/InterestLogic.cs b/AbazovApp/AccountsBusinessLogic/BusinessLogics/InterestLogic.cs
new file mode 100644
index 0000000..dfeeafe
--- /dev/null
+++ b/AbazovApp/AccountsBusinessLogic/BusinessLogics/InterestLogic.cs
@@ -0,0 +1,93 @@
+using AccountsContracts.BindingModels;
+using AccountsContracts.BusinessLogicContracts;
+using AccountsContracts.SearchModels;
+using AccountsContracts.StorageContracts;
+using AccountsContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace AccountsBusinessLogic.BusinessLogics
+{
+    public class InterestLogic : IInterestLogic
+    {
+        private readonly IInterestStorage _interestStorage;
+
+        public InterestLogic(IInterestStorage interestStorage)
+        {
+            _interestStorage = interestStorage;
+        }
+
+        public List<InterestViewModel>? ReadList(InterestSearchModel? model)
+        {
+            var list = model == null ? _interestStorage.GetFullList() : _interestStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                return null;
+            }
+            return list;
+        }
+
+        public InterestViewModel? ReadElement(InterestSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            var element = _interestStorage.GetElement(model);
+            if (element == null)
+            {
+                return null;
+            }
+            return element;
+        }
+
+        public bool Create(InterestBindingModel model)
+        {
+            CheckModel(model);
+            if (_interestStorage.Insert(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(InterestBindingModel model)
+        {
+            CheckModel(model);
+            if (_interestStorage.Update(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+        public bool Delete(InterestBindingModel model)
+        {
+            CheckModel(model, false);
+            if (_interestStorage.Delete(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(InterestBindingModel 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 интереса", nameof(model.Name));
+            }
+        }
+    }
+}