A model is developed for analyzing criminal procedure across nations and cultures, and applied to the U.S., France, the U.S.S.R. and China. The model envisions common functions of arrest and detention, screening, charging and defending, trial, sanctioning and appeal. The comparison reveals significant differences between inquisitorial and adversarial systems, including the extent of court authority to control other criminal justice agencies, the defendant's role in the proceedings, and the court's role in the proceedings. Differences between noncommunist and communist inquisitorial systems...