Sharia courts traditionally do not rely on lawyers; plaintiffs and defendants represent themselves. In Saudi Arabia and Qatar, which have preserved traditional procedure in Sharia courts, trials are conducted solely by the judge, and there is no jury system. There is no pre-trial discovery process, and no cross-examination of witnesses. Unlike common law, judges' verdicts do not set binding precedents under the principle of "stare decisis", and unlike civil law, Sharia is left to the interpretation in each case and has no formally codified universal statutes.