Each year approximately 2,500-3,000 students, primarily from clinical and counseling psychology programs, seek internship programs. But what is known about this key educational event? This article attempts to answer that question by reviewing the internship-related literature of the last 22 years. Existing literature demonstrates that there is a substantial body of knowledge but also points to the need for updates of old data and for additional new investigations.The clinical psychology internship was inaugurated in 1949 at the American Psychological Association's (APA's) Boulder Conference (Raimy, 1950) when delegates recommended both a university experience and an internship sequence as essential in the training of clinical psychologists. In 1952, the Division of Counseling Psychology followed suit by recommending a predoctoral internship training sequence for its students. Later, in 1956, as quality control became an issue, the APA, through its Office of Accreditation, began accrediting clinical and counseling internships. In 1968, the Association of Psychology Internship Centers (now the Association of Psychology Postdoctoral and Internship Centers [ APPIC]) was organized to respond to a growing array of internship issues that were beyond the scope of accreditation, and today APPIC stands as an essential organization concerned with all issues relevant to pre-and postdoctoral field training in clinical and counseling psychology.The internship has been and continues to be a required and essential ingredient in the training of clinical and counseling psychologists. But what is known about this key educational event? This article seeks to answer that question by reviewing internship-related literature generated over the past 22 years (1974 to 1996). A computer search of the PsycLIT database revealed over 269 entries during this period, including many