Plato's views on change and contrariety arise from concerns about definition and explanation in the aporetic Socratic dialogues that find more systematic analysis and resolution in the more constructive dialogues that follow. After developing these concerns, analyses, and solutions, we sketch Aristotle's quite different treatment of the same and other related issues.
Young, Charles and Bogen, James, "Change and Contrariety: Problems Plato Set for Aristotle" (1994). The Society for Ancient Greek Philosophy Newsletter. 163.