diff --git a/src/ZfcDatagrid/Column/Formatter/GenerateLink.php b/src/ZfcDatagrid/Column/Formatter/GenerateLink.php
index 132adafd..8a395d4a 100644
--- a/src/ZfcDatagrid/Column/Formatter/GenerateLink.php
+++ b/src/ZfcDatagrid/Column/Formatter/GenerateLink.php
@@ -38,7 +38,7 @@ public function __construct(ServiceManager $sm, $route, $key = null, $params = [
     }
 
     /**
-     * @param AbstractColumn $columnUniqueId
+     * @param AbstractColumn $column
      * @return string
      */
     public function getFormattedValue(AbstractColumn $column)
diff --git a/src/ZfcDatagrid/Column/Type/AbstractType.php b/src/ZfcDatagrid/Column/Type/AbstractType.php
index d205b0e7..fb1c03c6 100644
--- a/src/ZfcDatagrid/Column/Type/AbstractType.php
+++ b/src/ZfcDatagrid/Column/Type/AbstractType.php
@@ -36,4 +36,11 @@ public function getUserValue($val)
     {
         return $val;
     }
+
+    /**
+     * Get the type name
+     *
+     * @return string
+     */
+    abstract public function getTypeName();
 }
diff --git a/src/ZfcDatagrid/Column/Type/DateTime.php b/src/ZfcDatagrid/Column/Type/DateTime.php
index 07baf6f6..e89497dd 100644
--- a/src/ZfcDatagrid/Column/Type/DateTime.php
+++ b/src/ZfcDatagrid/Column/Type/DateTime.php
@@ -44,8 +44,8 @@ class DateTime extends AbstractType
      *
      * @param string  $sourceDateTimeFormat
      *                                      PHP DateTime format
-     * @param unknown $outputDateType
-     * @param unknown $outputTimeType
+     * @param int     $outputDateType
+     * @param int     $outputTimeType
      * @param string  $locale
      * @param string  $sourceTimezone
      * @param string  $outputTimezone
@@ -60,6 +60,9 @@ public function __construct($sourceDateTimeFormat = 'Y-m-d H:i:s', $outputDateTy
         $this->setOutputTimezone($outputTimezone);
     }
 
+    /**
+     * @return string
+     */
     public function getTypeName()
     {
         return 'dateTime';
diff --git a/src/ZfcDatagrid/Column/Type/Image.php b/src/ZfcDatagrid/Column/Type/Image.php
index 3192788b..24b883a4 100644
--- a/src/ZfcDatagrid/Column/Type/Image.php
+++ b/src/ZfcDatagrid/Column/Type/Image.php
@@ -21,6 +21,9 @@ class Image extends AbstractType
      */
     protected $resizeHeight = 20.5;
 
+    /**
+     * @return string
+     */
     public function getTypeName()
     {
         return 'image';
diff --git a/src/ZfcDatagrid/DataSource/AbstractDataSource.php b/src/ZfcDatagrid/DataSource/AbstractDataSource.php
index 48c0fe9e..c11bdd28 100644
--- a/src/ZfcDatagrid/DataSource/AbstractDataSource.php
+++ b/src/ZfcDatagrid/DataSource/AbstractDataSource.php
@@ -32,6 +32,21 @@ abstract class AbstractDataSource implements DataSourceInterface
      */
     protected $paginatorAdapter;
 
+    /**
+     * Set the data source
+     * - array
+     * - ZF2: Zend\Db\Sql\Select
+     * - Doctrine2: Doctrine\ORM\QueryBuilder
+     * - ...
+     *
+     * @param mixed $data
+     */
+    public function __construct($data)
+    {
+        // we need this exception, because a abstract __construct, create a exception in php-unit for mocking
+        throw new \Exception(sprintf('Missing __construct in %s', get_class($this)));
+    }
+
     /**
      * Set the columns
      *
@@ -126,4 +141,17 @@ public function getPaginatorAdapter()
     {
         return $this->paginatorAdapter;
     }
+
+    /**
+     * Get the data back from construct
+     * @return mixed
+     */
+    abstract public function getData();
+
+    /**
+     * Execute the query and set the paginator
+     * - with sort statements
+     * - with filters statements
+     */
+    abstract public function execute();
 }
diff --git a/src/ZfcDatagrid/Renderer/AbstractRenderer.php b/src/ZfcDatagrid/Renderer/AbstractRenderer.php
index 19f13558..15d7e421 100644
--- a/src/ZfcDatagrid/Renderer/AbstractRenderer.php
+++ b/src/ZfcDatagrid/Renderer/AbstractRenderer.php
@@ -14,8 +14,16 @@
 
 abstract class AbstractRenderer implements RendererInterface
 {
+    /**
+     *
+     * @var array
+     */
     protected $options = [];
 
+    /**
+     *
+     * @var string
+     */
     protected $title;
 
     /**
@@ -700,4 +708,30 @@ public function prepareViewModel(Datagrid $grid)
 
         $viewModel->setVariable('exportRenderers', $grid->getExportRenderers());
     }
+
+    /**
+     * Return the name of the renderer
+     * @return string
+     */
+    abstract public function getName();
+
+    /**
+     * Determine if the renderer is for export
+     * @return boolean
+     */
+    abstract public function isExport();
+
+    /**
+     * Determin if the renderer is HTML
+     * It can be export + html -> f.x.
+     * printing for HTML
+     * @return boolean
+     */
+    abstract public function isHtml();
+
+    /**
+     * Execute all...
+     * @return ViewModel Response\Stream
+     */
+    abstract public function execute();
 }