Introduction to the special issue on criterion measurement.

Criterion identification and measurement is often an afterthought in criterion-related validation research. Yet it is essential in determining what predictor measures to use in operational settings. Accordingly, this special issue discusses recent advances in addressing the "criterion problem" in U.S. military enlisted personnel selection and classification research. In this introductory paper, broad issues regarding criterion identification and measurement in the military and previous research on this topic are reviewed and subsequent papers, which address specific criterion issues and describe an unprecedented joint-service criterion project, are introduced. [ABSTRACT FROM AUTHOR]