Phenomenological Interpretations of Aristotle, the text of a lecture course presented at the University of Freiburg in the winter of 1921–22, was first published in 1985 as volume 61 of Heidegger's collected works. Preceding Being and Time, the work shows Heidegger introducing novel vocabulary as he searches for his genuine philosophical voice. Here, Heidegger first takes up the role of the definition of philosophy and then elaborates a conception of 'factical life,'or human life as it is lived concretely in relation to the world, a relation he calls 'caring.' Heidegger's descriptions of the movement of life are original, striking, and unique to this lecture course. As he works out a phenomenology of factical life, Heidegger lays the groundwork for a phenomenological interpretation of Aristotle, one of the pivotal influences in the development of his philosophy. As an early articulation of Heidegger's thought, this book will be an indispensable resource for scholars and students.