diff --git a/Admin/Install/Navigation.php b/Admin/Install/Navigation.php
index 0539c3d..fb98299 100644
--- a/Admin/Install/Navigation.php
+++ b/Admin/Install/Navigation.php
@@ -36,7 +36,7 @@ class Navigation
      *
      * @since  1.0.0
      */
-    public static function install(string $path = null, DatabasePool $dbPool = null) : void
+    public static function install(string $path, DatabasePool $dbPool) : void
     {
         \Modules\Navigation\Admin\Installer::installExternal($dbPool, ['path' => __DIR__ . '/Navigation.install.json']);
     }
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 5b413c2..5f55ff2 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -15,6 +15,7 @@ declare(strict_types=1);
 namespace Modules\ProjectManagement\Controller;
 
 use Modules\ProjectManagement\Models\ProjectMapper;
+
 use phpOMS\Asset\AssetType;
 use phpOMS\Contract\RenderableInterface;
 use phpOMS\Message\RequestAbstract;
@@ -41,7 +42,7 @@ final class BackendController extends Controller
      * @since  1.0.0
      * @codeCoverageIgnore
      */
-    public function viewProjectManagementList(RequestAbstract $request, ResponseAbstract $response, $data = null) : \Serializable
+    public function viewProjectManagementList(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
     {
         $view = new View($this->app, $request, $response);
         $view->setTemplate('/Modules/ProjectManagement/Theme/Backend/projectmanagement-list');
@@ -63,7 +64,7 @@ final class BackendController extends Controller
      * @since  1.0.0
      * @codeCoverageIgnore
      */
-    public function viewProjectManagementCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : \Serializable
+    public function viewProjectManagementCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
     {
         $view = new View($this->app, $request, $response);
         $view->setTemplate('/Modules/ProjectManagement/Theme/Backend/projectmanagement-create');
@@ -82,9 +83,9 @@ final class BackendController extends Controller
      * @since  1.0.0
      * @codeCoverageIgnore
      */
-    public function viewProjectManagementProfile(RequestAbstract $request, ResponseAbstract $response, $data = null) : \Serializable
+    public function viewProjectManagementProfile(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
     {
-        /** @var Head $head */
+        /** @var \phpOMS\Model\Html\Head $head */
         $head = $response->get('Content')->getData('head');
         $head->addAsset(AssetType::CSS, '/Modules/Calendar/Theme/Backend/css/styles.css');
 
diff --git a/Models/Project.php b/Models/Project.php
index 956a46a..7905cba 100644
--- a/Models/Project.php
+++ b/Models/Project.php
@@ -55,7 +55,7 @@ class Project
     /**
      * Created at.
      *
-     * @var \Datetime
+     * @var \DateTime
      * @since 1.0.0
      */
     private $createdAt = null;
diff --git a/Models/ProjectMapper.php b/Models/ProjectMapper.php
index 2df92d8..899edb6 100644
--- a/Models/ProjectMapper.php
+++ b/Models/ProjectMapper.php
@@ -57,11 +57,6 @@ final class ProjectMapper extends DataMapperAbstract
      *
      * @var array<string, array<string, null|string>>
      * @since 1.0.0
-     */    /**
-     * Has many relation.
-     *
-     * @var array<string, array<string, string>>
-     * @since 1.0.0
      */
     protected static $hasMany = [
         'tasks' => [