diff --git a/Classes/Domain/Model/Category.php b/Classes/Domain/Model/Category.php
new file mode 100644
index 0000000..eee4ad6
--- /dev/null
+++ b/Classes/Domain/Model/Category.php
@@ -0,0 +1,109 @@
+<?php
+namespace Mia3\Mia3Categories\Domain\Model;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+use Famelo\FameloCommon\ObjectStorageSorter;
+
+/**
+ * This model represents a category (for anything).
+ *
+ * @api
+ */
+class Category extends \TYPO3\CMS\Extbase\Domain\Model\Category
+{
+    /**
+     * @var integer
+     */
+    protected $sorting;
+
+    /**
+     * categories
+     *
+     * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Mia3\Mia3Categories\Domain\Model\Category>
+     * @lazy
+     */
+    protected $children = null;
+
+    /**
+     * @var \Mia3\Mia3Categories\Domain\Model\Category|NULL
+     * @lazy
+     */
+    protected $parent = null;
+
+    public function __toString()
+    {
+        return $this->title;
+    }
+
+    /**
+     * Returns the sorting
+     *
+     * @return integer $sorting
+     */
+    public function getSorting()
+    {
+        return $this->sorting;
+    }
+
+    /**
+     * Sets the sorting
+     *
+     * @param integer $sorting
+     * @return void
+     */
+    public function setSorting($sorting)
+    {
+        $this->sorting = $sorting;
+    }
+
+    /**
+     * @param \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Mia3\Mia3Categories\Domain\Model\Category> $children
+     */
+    public function setChildren($children)
+    {
+        $this->children = $children;
+    }
+
+    /**
+     * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Mia3\Mia3Categories\Domain\Model\Category>
+     */
+    public function getChildren()
+    {
+        return ObjectStorageSorter::sort($this->children, 'sorting');
+    }
+
+    public function getChildrenRecursive($children = array())
+    {
+        foreach ($this->children as $child) {
+            $children[] = $child;
+            $children = $child->getChildrenRecursive($children);
+        }
+
+        return $children;
+    }
+
+    public function getHasPages()
+    {
+        $children = $this->getChildrenRecursive();
+        $uids = array($this->getUid());
+        foreach($children as $child) {
+            $uids[] = $child->getUid();
+        }
+        $where = '  tablenames = "pages"
+                    AND fieldname = "categories"
+                    AND uid_local IN (' . implode(',', $uids) . ')';
+        $result = $GLOBALS['TYPO3_DB']->exec_SELECTcountRows('uid_local', 'sys_category_record_mm', $where);
+        return $result > 0;
+    }
+}
\ No newline at end of file
diff --git a/Classes/Domain/Repository/CategoryRepository.php b/Classes/Domain/Repository/CategoryRepository.php
new file mode 100644
index 0000000..adbf7a7
--- /dev/null
+++ b/Classes/Domain/Repository/CategoryRepository.php
@@ -0,0 +1,46 @@
+<?php
+namespace Mia3\Mia3Categories\Domain\Repository;
+
+    /*
+     * This file is part of the TYPO3 CMS project.
+     *
+     * It is free software; you can redistribute it and/or modify it under
+     * the terms of the GNU General Public License, either version 2
+     * of the License, or any later version.
+     *
+     * For the full copyright and license information, please read the
+     * LICENSE.txt file that was distributed with this source code.
+     *
+     * The TYPO3 project - inspiring people to share!
+     */
+
+/**
+ * Repository for Category models.
+ *
+ * @api
+ */
+class CategoryRepository extends \TYPO3\CMS\Extbase\Domain\Repository\CategoryRepository
+{
+    /**
+     * Initializes the repository.
+     *
+     * @return void
+     */
+    public function initializeObject()
+    {
+        /** @var $querySettings \TYPO3\CMS\Extbase\Persistence\Generic\Typo3QuerySettings */
+        $querySettings = $this->objectManager->get(\TYPO3\CMS\Extbase\Persistence\Generic\Typo3QuerySettings::class);
+        $querySettings->setRespectStoragePage(FALSE);
+        $querySettings->setRespectSysLanguage(FALSE);
+        $this->setDefaultQuerySettings($querySettings);
+    }
+
+    public function findByUids($uids) {
+        if (is_string($uids)) {
+            $uids = explode(',', $uids);
+        }
+        $query = $this->createQuery();
+        $query->matching($query->in('uid', $uids));
+        return $query->execute();
+    }
+}
diff --git a/Configuration/TCA/Overrides/sys_category.php b/Configuration/TCA/Overrides/sys_category.php
new file mode 100644
index 0000000..8fa258a
--- /dev/null
+++ b/Configuration/TCA/Overrides/sys_category.php
@@ -0,0 +1,29 @@
+<?php
+
+$temporaryColumns = array(
+    'sorting' => array(
+        'exclude' => 1,
+        'label' => 'Sortierung',
+        'config' => array(
+            'type' => 'passthrough'
+        ),
+    ),
+    'children' => array(
+        'exclude' => 1,
+        'label' => 'Unterkategorien',
+        'config' => array(
+            'type' => 'select',
+            'renderType' => 'selectMultipleSideBySide',
+            'foreign_table' => 'sys_category',
+            'foreign_field' => 'parent',
+            'foreign_table_where' => ' AND (sys_category.sys_language_uid = 0 OR sys_category.l10n_parent = 0) ORDER BY sys_category.sorting',
+            'size' => 10,
+            'autoSizeMax' => 20,
+            'minitems' => 0,
+            'maxitems' => 20
+        ),
+    )
+);
+
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns('sys_category', $temporaryColumns);
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCAtypes('sorting,children');
diff --git a/ext_tables.sql b/ext_tables.sql
new file mode 100644
index 0000000..08b8fba
--- /dev/null
+++ b/ext_tables.sql
@@ -0,0 +1,6 @@
+#
+# Table structure for table 'sys_category'
+#
+CREATE TABLE sys_category (
+	children int(11) unsigned DEFAULT '0' NOT NULL
+);
\ No newline at end of file
diff --git a/ext_typoscript_setup.txt b/ext_typoscript_setup.txt
new file mode 100644
index 0000000..d2ef512
--- /dev/null
+++ b/ext_typoscript_setup.txt
@@ -0,0 +1,19 @@
+config.tx_extbase{
+	persistence{
+		classes{
+
+			TYPO3\CMS\Extbase\Domain\Model\Category {
+				subclasses {
+					Tx_Mia3Categories_Category = Mia3\Mia3Categories\Domain\Model\Category
+
+				}
+			}
+			Mia3\Mia3Categories\Domain\Model\Category {
+				mapping {
+					tableName = sys_category
+				}
+			}
+
+		}
+	}
+}
\ No newline at end of file