The affirmative action in the sphere of electoral rules is one of the ways to establish effective participation of persons belonging to national minorities. The Venice Commission Code of Good Practice in Electoral Matters provides some basic principles for developing electoral affirmative action rules in accordance with European electoral heritage, such as: Parties representing national minorities, guaranteed reserved seats for members of nationals, electoral thresholds should not affect the chances of national minorities to be represented, electoral districts (their number, the size and form, the magnitude) may be designed with the purpose to enhance the minorities' participation in the decision-making processes.