To avoid these shortcomings, boundary delimitation should take place in a transparent and consistent manner, established by a law that also regulates the frequency of reviewing boundaries. The Venice Commission has repeatedly recommended that “[t]he procedure for delimiting electoral districts should be defined precisely in a law, so that the process remains the same, regardless of who is drawing the district boundaries.” In this regard, the existence of legal restrictions to discretionary powers act as an important legal safeguard against arbitrariness and guarantee the Rule of Law. In the field of constituency delimitation, a way to prevent such an abuse is, where possible, to make constituency boundaries coincide with administrative boundaries, while geographical and historic criteria may be taken into account.