Zabarella Jacopo (1532–89), Italian Aristotelian philosopher who taught at the University of Padua. He wrote extensive commentaries on Aristotle’s Physics and On the Soul and also discussed other interpreters such as Averroes. However, his most original contribution was his work in logic, Opera logica (1578). Zabarella regards logic as a preliminary study that provides the tools necessary for philosophical analysis. Two such tools are order and method: order teaches us how to organize the content of a discipline to apprehend it more easily; method teaches us how to draw syllogistic inferences. Zabarella reduces the varieties of orders and methods classified by other interpreters to compositive and resolutive orders and methods. The compositive order from first principles to their consequences applies to theoretical disciplines. The resolutive order from a desired end to means appropriate to its achievement applies to practical disciplines. This much was already in Aristotle. Zabarella offers an original analysis of method. The compositive method infers particular consequences from general principles. The resolutive method infers originating principles from particular consequences, as in inductive reasoning or in reasoning from effect to cause. It has been suggested that Zabarella’s terminology might have influenced Galileo’s mechanics. P.Gar.