diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e9b4371..4bbb819 100755
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -16,7 +16,7 @@ Generally, the development philosophy is result orientated. This means that anyo
 
 Developers  are encouraged to pick open tasks with high priorities according to their own skill level. Senior developers may  directly assign tasks to developers based on their importance. New  developers may find it easier to start with a task that has a low  priority as they often also have a lower difficulty.
 
-Open tasks can be found in the project overview: [PROJECT.md](../Project/PROJECT.md)
+Open tasks can be found in the project overview: [PROJECT.md](https://github.com/Karaka-Management/Organization-Guide/blob/master/Project/PROJECT.md)
 
 Tasks  currently in development are prefixed in the priority column with an  asterisk `*` and a name tag in the task description of the developer who is working on the task.
 
diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 7823bf0..a6e5272 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -59,7 +59,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiKanbanCardCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiKanbanCardCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateKanbanCardCreate($request))) {
             $response->set('kanban_card_create', new FormValidation($val));
@@ -179,7 +179,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiKanbanCardCommentCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiKanbanCardCommentCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateKanbanCardCommentCreate($request))) {
             $response->set('kanban_comment_create', new FormValidation($val));
@@ -262,7 +262,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiKanbanBoardCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiKanbanBoardCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateKanbanBoardCreate($request))) {
             $response->set('kanban_board_create', new FormValidation($val));
@@ -352,7 +352,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiKanbanBoardUpdate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiKanbanBoardUpdate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         $old = clone KanbanBoardMapper::get()->where('id', (int) $request->getData('id'))->execute();
         $new = $this->updateBoardFromRequest($request);
@@ -396,7 +396,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiKanbanColumnCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiKanbanColumnCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateKanbanColumnCreate($request))) {
             $response->set('kanban_column_create', new FormValidation($val));
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index df43b24..bc8ce34 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -49,7 +49,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function setupStyles(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function setupStyles(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         /** @var \phpOMS\Model\Html\Head $head */
         $head = $response->get('Content')->getData('head');
@@ -68,7 +68,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewKanbanDashboard(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewKanbanDashboard(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
 
@@ -100,7 +100,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewKanbanBoard(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewKanbanBoard(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
 
@@ -144,7 +144,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewKanbanArchive(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewKanbanArchive(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/Kanban/Theme/Backend/kanban-archive');
@@ -175,7 +175,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewKanbanBoardCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewKanbanBoardCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
 
@@ -207,7 +207,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewKanbanCard(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewKanbanCard(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
 
diff --git a/Models/KanbanBoardMapper.php b/Models/KanbanBoardMapper.php
index 04b27bb..f892cff 100755
--- a/Models/KanbanBoardMapper.php
+++ b/Models/KanbanBoardMapper.php
@@ -70,7 +70,7 @@ final class KanbanBoardMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [
diff --git a/Models/KanbanCardCommentMapper.php b/Models/KanbanCardCommentMapper.php
index ade4af5..5249147 100755
--- a/Models/KanbanCardCommentMapper.php
+++ b/Models/KanbanCardCommentMapper.php
@@ -61,7 +61,7 @@ final class KanbanCardCommentMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [
diff --git a/Models/KanbanCardMapper.php b/Models/KanbanCardMapper.php
index 4eb16dd..dddaaeb 100755
--- a/Models/KanbanCardMapper.php
+++ b/Models/KanbanCardMapper.php
@@ -54,7 +54,7 @@ final class KanbanCardMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [