Book excerpt: This is the 4th volume in a series that will include the histories of as many of the American Psychological Association's (APA) 52 divisions as possible. More than 50 yrs ago the APA was reorganized around a set of divisions structured to represent the diverse interests of constituent groups of psychologists within the organization of that time. Although the number of divisions has grown since, the basic structure remains intact. It is through these divisions that the unity of APA was reestablished. This text provides the histories of 7 of the 52 divisions. (PsycINFO Database Record (c) 2004 APA, all rights reserved).