Aristotel’s psychology is an integral part of a more comprehensive scientific system. He was the first Greek thinker to recognize that the objects of knowledge fall into different domains, each of which belongs to a distinct science.
Aristotle offers a comprehensive classification of the sciences. All thought, according to Aristotle, is either theoretical, practical, or productive: the theoretical (or contemplative) aims at knowledge of truth for its own sake, the practical at good action, and the productive at useful or beautiful objects.
These three types are further divided: the sub-types of theoretical thought are philosophy (later called metaphysics), mathematics and natural science; the sub-types of practical thoughts are ethics, household management, and politics; and the sub-types of productive thought are the useful arts (e.g. carpentry and medicine) and mimetic arts (e.g. sculpture, painting, and poetry).
As for logic, Aristotle suggests that one should master it before embarking on any specialized study, and later Aristotelians treated it as an instrument (organon) – a discipline presupposed by all the sciences rather than a science in its own right.
Fred D. Miller Jr.
(Introduction to Aristotle: On the Soul and Others Psychological Works (trad. Fred D. Miller Jr), Oxford University Press, 2018, la p. XIV-XV)