This collection contains studies of two large-scale national survey databases that have rich information on on-the-job training. The following papers are included: "On-the-Job Training/Sorting: Theory and Evidence," by John Bishop and Suk Kang; "The Magnitude and Determinants of On-the-Job Training," by John Bishop; "Impacts of Training," by John Bishop; "Substitutability of Work-Related Preparation and On-the-Job Training," by Suk Kang; "The Nature and Impact of Training: Evidence from the Current Population Survey," by Kevin Hollenbeck and Richard Willke; and "Implications and Policy Recommendations," by John Bishop. Seventy-eight data tables and eight figures are included. (MN)