protected function getResponseGroups()
    {
        $resGroups = $this->request->variables['ResponseGroups'];
        for ( $i = 0, $iMax = count( $this->defaultResponsegroups ); $i < $iMax; ++$i )
        {
            if ( !in_array( $this->defaultResponsegroups[$i], $resGroups ) )
                $resGroups[] = $this->defaultResponsegroups[$i];
        }

        return $resGroups;
    }