public function definition() {
        $mform = $this->_form;

        $workshop = $this->_customdata['workshop'];

        $mform->addElement('header', 'general', get_string('evaluationsettings', 'mod_workshop'));

        $this->definition_sub();

        $mform->addElement('submit', 'submit', get_string('aggregategrades', 'workshop'));
    }