The purpose of this dissertation is to show how it is that three interpreters of Aristotle's texts on deliberation and the practical syllogism come to views which differ considerably from each other. I argue that the differences are largely due to which set of texts the interpreter takes as most important in relation to Aristotle's theory of the practical syllogism. Neither G. E. M. Anscombe, John M. Cooper, nor Martha Craven Nussbaum has expressed adequately Aristotle's use of the practical syllogism (...) in his writings. I argue that the practical syllogism is one phenomenon for which Aristotle has different purposes in the different places that it appears in his texts. Due to its different appearances, it is sometimes given different interpretations because of the context in which it appears. ;In the first chapter I list several texts which are relevant to Aristotle's theory of deliberation and of the practical syllogism. I then state briefly the kinds of views that are held on the relationship between deliberation and the practical syllogism, which leads me to formulate the questions to which this dissertation is to offer answers. In order to respond to these questions, I develop a separate set of questions which guide my examination of the interpretations by Anscombe, Cooper, and Nussbaum on deliberation and the practical syllogism in Aristotle's texts. My elucidation of these three interpreters' views is shown in chapters two through four. In the fifth and final chapter, I return to the former questions and answer them according to my elucidations of the interpreters' views. I then take four passages from Aristotle--DA 434a16-21, MA 701a17-25, EN 1112b11-12, 15-20, and EN 1147a24-28--which passages are important to his theory of the practical syllogism, and show the differences among the interpretations of these passages by Anscombe, Cooper, and Nussbaum. This, in conjunction with what I have shown up to this point, enables me to offer a conclusion concerning the entire controversy. My conclusion is compatible with the view that the practical syllogism and deliberation are one phenomenon for Aristotle, which phenomenon he puts to several uses. (shrink)