diff --git a/Criteria.php b/Criteria.php
new file mode 100644
index 0000000..486f596
--- /dev/null
+++ b/Criteria.php
@@ -0,0 +1,103 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Alexandre
+ * Date: 29/09/2017
+ * Time: 13:47
+ */
+
+namespace Frogg;
+
+use Phalcon\Mvc\Model as PhalconModel;
+
+/**
+ * Class Criteria
+ *
+ * default call criteria on model, example:
+ *
+ *     public static function query(DiInterface $dependencyInjector = null)
+ *     {
+ *         return parent::query($dependencyInjector)->softDelete();
+ *     }
+ *
+ * @package Frogg
+ * @method static addSoftDelete(string $column = 'deleted', int $activeValue = 0) add soft delete criteria to the query
+ * @method static removeSoftDelete() removes soft delete criteria from the criteriaQueue
+ */
+class Criteria extends PhalconModel\Criteria
+{
+    private $modelCriterias = [];
+
+    /**
+     * removes soft deleted entries from the result.
+     *
+     * @param string $column
+     * @param int    $activeValue
+     *
+     * @return PhalconModel\Criteria
+     * @internal param $add
+     *
+     */
+    public function softDeleteCriteria($column = 'deleted', $activeValue = 0)
+    {
+        return $this->andWhere($column.'='.$activeValue);
+    }
+
+    /**
+     * alias to make more sense when calling it on query building.
+     *
+     * @return $this
+     */
+    public function withDeleted()
+    {
+        return $this->removeSoftDelete();
+    }
+
+    public function execute()
+    {
+        $instance = $this;
+        foreach ($this->modelCriterias as $criteria => $value) {
+            $method   = lcfirst($criteria).'Criteria';
+            $instance = $instance->$method(...$value);
+        }
+
+        return $instance->parentExecute();
+    }
+
+    public function getPhql()
+    {
+        return $this->createBuilder()->getPhql();
+    }
+
+    public function getQuery()
+    {
+        return $this->createBuilder()->getQuery();
+    }
+
+    public function getActiveCriterias()
+    {
+        return $this->modelCriterias;
+    }
+
+    private function parentExecute()
+    {
+        return parent::execute();
+    }
+
+    public function __call($name, $arguments)
+    {
+        if (strpos($name, 'add') !== false) {
+            $criteria                        = str_replace('add', '', $name);
+            $this->modelCriterias[$criteria] = $arguments;
+        } else if (strpos($name, 'remove') !== false) {
+            $criteria = str_replace('remove', '', $name);
+            if (isset($this->modelCriterias[$criteria])) {
+                unset($this->modelCriterias[$criteria]);
+            }
+        } else {
+            Throw new \Exception('Method '.$name.' does not exist.');
+        }
+
+        return $this;
+    }
+}
diff --git a/Model.php b/Model.php
index 3971f54..9ddac7b 100644
--- a/Model.php
+++ b/Model.php
@@ -3,16 +3,33 @@
 namespace Frogg;
 
 use Frogg\Crypto\WT;
+use Phalcon\Di;
+use Phalcon\DiInterface;
 use Phalcon\Mvc\Model as PhalconModel;
 
-/**
- * Class Model
- * @package Frogg
- *
- * @method static static findFirstById(int $id)
+/**        
+ * Class Model        
+ * @package Frogg        
+ *        
+ * @method static static findFirstById(int $id)        
  */
 class Model extends PhalconModel
 {
+    /**
+     * @param DiInterface|null $dependencyInjector
+     *
+     * @return \Frogg\Criteria $criteria
+     */
+    public static function query(DiInterface $dependencyInjector = null)
+    {
+        $class = '\\'.get_called_class().'Criteria';
+        /** @var \Frogg\Criteria $criteria */
+        $criteria = new $class();
+        $criteria->setDI($dependencyInjector ?? Di::getDefault());
+        $criteria->setModelName(get_called_class());
+
+        return $criteria;
+    }
 
     public function columnMap()
     {
@@ -30,24 +47,14 @@ public function columnMap()
         return $columnMap;
     }
 
-    /**
-     * @param string $attribute Name of the attribute that will be used to create a permalink
-     *
-     * @return string A permalink formatted string
-     */
-    public function permalinkFor(string $attribute): string
+    public function permalinkFor($attribute)
     {
         $tmp = new Permalink($this->$attribute);
 
         return $this->getNumeration($tmp->create());
     }
 
-    /**
-     * @param array $values Values that will be used to create a permalink
-     *
-     * @return string A permalink formatted string
-     */
-    public function permalinkForValues(array $values): string
+    public function permalinkForValues($values)
     {
         for ($i = 0; $i < count($values); $i++) {
             $values[$i] = Permalink::createSlug($values[$i]);
@@ -57,7 +64,7 @@ public function permalinkForValues(array $values): string
         return $this->getNumeration($value);
     }
 
-    public function tokenId($key): string
+    public function tokenId($key)
     {
         return WT::encode(['id' => $this->id], $key);
     }
@@ -69,7 +76,7 @@ public static function getByTokenId($token, $key)
         return isset($data->id) ? static::findFirstById($data->id) : false;
     }
 
-    private function getNumeration($slug): string
+    private function getNumeration($slug)
     {
         $resultset = $this->getReadConnection()->query("SELECT `permalink`
 														FROM `".$this->getSource()."`
@@ -89,3 +96,4 @@ private function getNumeration($slug): string
     }
 
 }
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..a6bc11b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,54 @@
+#### Model Criteria usage example:
+
+```php
+class ModelCriteria extends Frogg\Criteria
+{
+    /**
+     * @return \Phalcon\Mvc\Model\Criteria
+     */
+    public function ofUser($id)
+    {
+        return $this->where('user_id = '.$id);
+    }
+}
+```
+
+```php
+$result = Model::query()->ofUser(1)->where('x' > 'y')->execute();
+```
+
+#### Global Criteria usage example:
+
+```php
+class Model extends Frogg\Model
+{
+    /**
+     * @return ModelCriteria
+     */
+    public static function query(DiInterface $dependencyInjector = null)
+    {
+        return parent::query($dependencyInjector)->addSoftDelete();
+    }
+}
+```
+
+```php
+// this result applies softDelete for default, so all 'deleted = 1' results will be filtered 
+// (this filter is added at the end of the query)
+$result = Model::query()->where('x' > 'y')->execute();
+
+// but you can remove a global criteria calling removeCriteriaName
+$resultWithDeleted = Model::query()->removeSoftDelete()->where('x' > 'y')->execute();
+// or for this specific method, we have an alias
+$resultWithDeleted = Model::query()->withDeleted()->where('x' > 'y')->execute();
+```
+
+#### Debugg tip
+
+You can get some infos like:
+```php
+$builder         = Model::query()->where('x' > 'y');
+$phql            = $builder->getPhql();
+$buildedQuery    = $builder->getQuery();
+$criterias       = $builder->getActiveCriterias();
+```