Worker behaviors before and after stress management training were assessed in 300 workers employed in a municipal highway maintenance department. The stress management training program was offered at the work site during regular working hours for 2 consecutive work weeks. A total of 45 workers participated and were randomly assigned to biofeedback, muscle relaxation, or wait list comparison groups. A total of 37 workers completed the training. Psychophysiological and subjective measures were assessed during the training sessions and 3 months after the last training session. Personnel data including absenteeism, performance ratings, equipment accidents, and work injuries were also used for evaluation. The pretraining evaluation period was 2.5 years, and the post training evaluation period was the first 1.5 years immediately after training. Product moment correlations between employee behaviors and age, race, and gender were not significant. Multiple regression analyses indicated significant changes in absenteeism measures for the muscle relaxation group but not the biofeedback group. The differential results were discussed in relation to limitations on the internal validity of the quasiexperimental design and the uniformity of the criterion variables over the post training period. The authors conclude that the primary benefits of stress management are on worker psychophysiology and perceptions of individual stress.