KATHERINE J. KLEIN is associate professor of industrial and organizational psychology at the University of Maryland. She is the author of numerous books, chapters, and articles, a fellow of the Society for Industrial and Organizational Psychology and the American Psychological Association, and a member of the editorial boards of key professional journals. Klein resides in Washington, D.C. STEVE W.J. KOZLOWSKI is professor of organizational psychology and program head at Michigan State University. The author of numerous books, chapters and articles, he serves on the editorial boards of key professional journals and is a fellow of the American Psychological Association and the Society for Industrial and Organizational Psychology.