I will now argue that Aristotle develops his logic in order to combat the intellectual and moral shortcomings of traditional dialectic. In his Organon he inaugurates a disciplined mode of reasoning in which interlocutors could reach important truths about the subject of their discussion without detriment to their moral integrity. In maintaining that Aristotle's logic, Prior Analytics in particular, is concerned with substantive reasoning, I oppose the contemporary view that it is a formal science dealing with abstract syllogistic forms of argument, initiated by the great Polish logician Jan Lukasiewicz. In the first part of my paper I defend the thesis that Aristotle's syllogistic is a techne of theoretical and practical reasoning. Aristotle's Syllogistic techne .
All humans are animals.
Therefore, all humans are mortal. In Prior Analytics Aristotle examines when a conclusion does or does not necessarily follow from two categorical premises containing three such terms, no matter what terms replace the variables. Applying Aristotle's rules, one can formulate valid arguments and detect arguments which are invalid because the statements are not of the correct linguistic form. Thus Aristotle's logic marks the beginning of formal logical reasoning. His rules of inference are powerful means not only for avoiding fallacies in one's own reasoning but for discovering faults in others'.