Many Muslim countries have developed similar rules about legal education and the legal profession, but some still allow lawyers with training in traditional Islamic law to practice law before personal status law courts. In China and other developing countries there are not sufficient professionally trained people to staff the existing judicial systems, and, accordingly, formal standards are more relaxed. The Catholic Church has the oldest continuously functioning legal system in the western world, predating the evolution of modern European civil law and common law systems. The Eastern Catholic Churches, which developed different disciplines and practices, are governed by the Code of Canons of the Eastern Churches. The canon law of the Catholic Church influenced the common law during the medieval period through its preservation of Roman law doctrine such as the presumption of innocence.
- Consideration indicates the fact that all parties to a contract have exchanged something of value.