The Greek tradition that survived to influence later cultures, however, was the Peripatetic tradition which originated in Aristotle's collection of works known as the "Organon" or instrument, the first systematic Greek work on logic. In fact, Aristotle is often called the first great logician. Although he did not use these terms himself, Aristotle introduced the formal study of what is now known as formal logic, that is; logic that is concerned with the form, not the content, of statements or propositions, and the relationships that exist between different statements on the basis of their form—some statements being accepted (as premises), other statement(s) follow (as conclusion(s)) from those accepted statements because of their form.