This course is devoted to explain the contents and nature of Nazariyyat al-Zuruf al-Tari’ah i.e. the Theory of Contingencies in Islamic and statutes legal systems. It studies the general principles on which the theory relies, the general and specific proofs for its legitimacy. It also deals with some of the major principles relating to it, such as the theory of excuse in the leasing and hiring contract, and the theory of al-Jawa’ih i.e. a disaster that damages or loses the crops. Further, this course sheds light on the applications of this theory which concern the private and public rights. Moreover, it provides a comparative study to the latter theory between Islamic Jurisprudence and the statute legal systems.