De finibus bonorum et malorum ("On the ends of good and evil") is a Socratic dialogue by the Roman orator, politician, and Academic Skeptic philosopher Marcus Tullius Cicero. It consists of three dialogues, over five books, in which Cicero discusses the philosophical views of Epicureanism, Stoicism, and the Platonism of Antiochus of Ascalon which supports a hybrid system of Platonism, Aristotelianism (which he views as a single "Old Academy" tradition), and Stoicism. The treatise is structured so that each philosophical system is described in its own book, and then disputed in the following book (with exception of Antiochus' view which is both explained and disputed in book five). The book was developed in the summer of the year 45 BC, and was written over the course of about one and a half months. Together with the Tusculanae Quaestiones written shortly afterwards and the Academica, De finibus bonorum et malorum is one of the most extensive philosophical works of Cicero.