Abstract

This article examines the relationship between unity and progress in psychology. It contends that psychologists have traditionally sought unity in order to fulfill positivistic criteria of progress and success. In accordance with innovations in the philosophy of science, and in accordance with recent trends toward methodological pluralism, such unity is neither required nor recommended. However, a problem that arises under the new philosophy of science &emdash; incommensurability &emdash; must also be addressed. It is argued that before psychology can be a coherent discipline, three important questions pertaining to incommensurability must be answered