diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index e85e584..633cff4 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -31,7 +31,7 @@ use Modules\Organization\Models\DepartmentMapper;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class BackendController extends Controller
+final class BackendController extends Controller
 {
 
     /**
diff --git a/Models/Employee.php b/Models/Employee.php
index e95f8f3..4f1b351 100644
--- a/Models/Employee.php
+++ b/Models/Employee.php
@@ -24,7 +24,7 @@ use Modules\Admin\Models\Account;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Employee
+final class Employee
 {
 
     /**
diff --git a/Models/EmployeeHistory.php b/Models/EmployeeHistory.php
index c3c928e..a0c2fef 100644
--- a/Models/EmployeeHistory.php
+++ b/Models/EmployeeHistory.php
@@ -22,7 +22,7 @@ namespace Modules\HumanResourceManagement\Models;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class EmployeeHistory
+final class EmployeeHistory
 {
 
 }
diff --git a/Models/EmployeeHistoryMapper.php b/Models/EmployeeHistoryMapper.php
index b663a7f..4a59b5e 100644
--- a/Models/EmployeeHistoryMapper.php
+++ b/Models/EmployeeHistoryMapper.php
@@ -16,6 +16,6 @@ namespace Modules\HumanResourceManagement\Models;
 
 use phpOMS\DataStorage\Database\DataMapperAbstract;
 
-class EmployeeHistoryMapper extends DataMapperAbstract
+final class EmployeeHistoryMapper extends DataMapperAbstract
 {
 }
diff --git a/Models/EmployeeMapper.php b/Models/EmployeeMapper.php
index 3093409..f132f92 100644
--- a/Models/EmployeeMapper.php
+++ b/Models/EmployeeMapper.php
@@ -20,7 +20,7 @@ use Modules\Organization\Models\DepartmentMapper;
 use Modules\Organization\Models\PositionMapper;
 use phpOMS\DataStorage\Database\DataMapperAbstract;
 
-class EmployeeMapper extends DataMapperAbstract
+final class EmployeeMapper extends DataMapperAbstract
 {
 
     /**
diff --git a/Models/StaffList.php b/Models/StaffList.php
index dec19c2..44c697b 100644
--- a/Models/StaffList.php
+++ b/Models/StaffList.php
@@ -24,7 +24,7 @@ use phpOMS\DataStorage\Database\DatabaseType;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class StaffList
+final class StaffList
 {
 
     /**