Tarek Dika presents a systematic account of Descartes' method and its efficacy. He develops an ontological interpretation of Descartes's method as a dynamic and, within limits, differentiable problem-solving cognitive disposition or "habitus", which can be actualized or applied to different problems in various ways, depending on the nature of the problem. Parts I-II of the book develop the foundations of such an "habitual" interpretation of Descartes's method, while Parts III-V demonstrate the fruits of such an interpretation in metaphysics, natural philosophy, and mathematics. This is the first book to draw on the recently-discovered "Cambridge manuscript" of Descartes's Rules for the Direction of the Mind (1620s): it gives a concrete demonstration of the efficacy of Descartes's method in the sciences and of the underlying unity of Descartes's method from Rules for the Direction of the Mind to Principles of Philosophy (1644).

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Tarek Dika is an Assistant Professor in the Department of Philosophy at the University of Toronto. In 2016-2021, he was an Assistant Professor in the Program of Liberal Studies and a Faculty Member in the Program in History and Philosophy of Science at the University of Notre Dame, where he was also a Fellow in the Medieval Institute and a Concurrent Assistant Professor in the Department of Philosophy. In 2013-2016, he was a Postdoctoral Fellow in the Michigan Society of Fellows. Dika currently serves on the Comité de Lecture of Revue de Métaphysique et de Morale.