First published in 1962 and substantially extended for its second edition in 1985, Watt's Islamic Philosophy and Theology is widely recognised as the standard general account in English. Now re-issued in the new Islamic Surveys format, it is available for another generation of students and scholars. Watt takes the reader through the development of philosophy and theology in Islam from the Umayyad period to modern Islamic philosophy. He shows how medieval Islam assimilated Greek thought, particularly Aristotelian logic, in its early stages, and traces the development of Islamic philosophy to the early middle ages. He then examines the elaboration of Shiism and the supposed stagnation of Islamic thought from the fifteenth to the nineteenth centuries.