Following the collapse of communist rule in Central and Eastern Europe and the former Soviet Union, constitutional designers codified rules establishing independent judiciaries. To what degree do these constitutional and statutory guarantees of independence reflect the actual behavior of courts? Our analysis demonstrates that official judicial power does not predict expressions of judicial reviewoverturning legislation in whole or in part. Rather, exogenous factors, including economic conditions, executive power, identity of the litigants and legal issues, influence the likelihood that courts will nullify laws. Our findings should caution both scholars and institutional designers. Both formal and informal factors create the parameters in which courts operate. Although courts have become more powerful institutions in the post-communist era, they face a diverse set of constraints on independent action.Although independent judiciaries are important actors in democratic consolidation, how expressions of judicial independence evolve in transitional societies remains unclear. Ideally, courts review legislation and government decisions under the rubric of constitutionality. That is, the judiciary is able to declare laws and actions unconstitutional and serve as a check against excesses by other branches of government. A strong judiciary in newly independent countries helps the state break with its authoritarian past and develop a constitutional culture that teaches state actors that the legal system cannot be transgressed for political gain (Brewer-Carias 1989;Larkins 1996). However, the development of an independent judiciary can be constrained by a weak institutional legacy, limited training and support for judges, and the strength of other political actors. If the judiciary does not have the authority to make independent decisions, democratic progress