WILLIAM J. ROTHWELL is associate professor in The Department of Adult Education, Instructional Systems, and Workforce Education and Development at The Pennsylvania State University. He is the coauthor of Improving On-the-Job Training (1994) and Mastering the Instructional Design Process (1992), both from Jossey-Bass. PETER S. COOKSON is a professor at the Centre for Distance Education at Athabasca University in Alberta, Canada. He is the editor of Recruiting and Retaining Adult Students (Jossey-Bass, 1989).