The effectiveness of an industrial lift truck safety training program was studied. A training program was developed using a slide presentation with manual for the instructor. Five training sessions were held dealing with operationally defined safe work practices. A post training management program was established consisting of initial daily feedback, followed by group performance goal setting, peer group modeling, trainee participation, and management support. Two studies of the effectiveness of these programs were performed in separate warehouses. In the first, trained lift operators and trained operators receiving feedback were compared with a group receiving neither. Error rates on individual criterion behaviors were observed. In the second study all operators were trained and all received feedback. Their performance was evaluated before and after training. The training plus feedback group showed a 23 percent decrease in error rate, with an 18 percent decrease in the training only group and 6 percent for comparisons. Error rates tended to converge at the end of the early post training period with an improvement in performance of 24 percent after institution of the post training management program. In the second study training resulted in an immediate 61 percent improvement in performance scores. In the management phase an additional 22 percent gain was found. The authors conclude that occupational safety training is effective. It can last beyond daily feedback continuation of peer modeling and continued management support. The behavior sampling procedure is useful to develop and evaluate the program.