The study describes and systemises the constitutional requirements on legislation in Eastern Europe. The comparison reveals that the basic structures of the legislative process live up to the standards of the rule of law. The details, however, are quite frequently deficient or problematic. Laws requiring a qualified majority often cause structural problems, based on poor political culture, and the vague and contradictory regulatory framework. Other problems are a legacy of socialism, e.g. the instrumental perception of the law, or the immature separation of powers. However, the apparent homogeneity of the region and its structural problems that was typical of the socialist era, has given way to a stronger differentiation which often reflects differences that existed prior to the socialist dictatorship. This stronger differentiation concerns, i.a. the extent of executive law-making, the structure of parliament (mono- or bicameral), the majority requirement for the decisions in parliament, and the participation of the people in legislation. In the states that have joined the EU, the European criteria of the rule of law have had their effect, whereas the candidate states on the Wester Balkans are on the way of consolidating their legislative system. Further to the East, the rule of law becomes weaker and weaker.