P rinciples of Islamic Jurisprudence is a translation of the first volume of Ayatollah Muhammad Baqir al-Sadr’s seminal work, Durus fi ‘Ilm al-Usul. In this famous textbook, the author explicates the development of the essential principles of Islamic jurisprudence in the Shi‘a tradition in a clear and well-reasoned fashion. Unlike some of Ayatollah al-Sadr’s other complex works, Principles of Islamic Jurisprudence is designed to be accessible to novice students and is frequently taught as an introductory work in Shi‘i seminaries. An ideal guide for students of and researchers in Islamic law.