Reviews the personnel literature on the development of job families and discusses the implications for personnel selection. Job family development is viewed as essentially a matter of behavior classification in the world of work. Accordingly, the review focuses on the basic taxonomic issues of objective, content, and method in job family construction. The discussion section explores the implications for several related objectives in personnel selection, all of which reflect different aspects of the broader objective of generalizing selection procedure validity. It is concluded that the approaches to developing job families that emphasize either the human attribute requirements or broad content structure of jobs are likely to prove more useful for both theory development and practical application in personnel selection than are approaches based on more molecular analyses of jobs. (4 p ref)