A NIOSH sponsored workshop was organized to address questions concerning the ability of self control or even perceived control over environmental stimuli and demands and the relationship of this control to health outcomes. The papers generated by this workshop were included in the report. Data were presented on the effects of control type phenomena; there appears to be a clear convergence in the opinion that control at work has important health implications. Specific topics considered at the workshop included the control of job stress through establishing control over the job, the psychosocial work environment, worker control and well being, stress control and implications for health at work, cognitive social learning analysis of the coping process, psychophysiological mechanisms related to control and coping resulting in health implications, coping behavior, epidemiological perspectives on the role of control in health, the theoretical/empirical basis for occupational stress impacts of control, methodological concerns in job stress research on controllability, and the implications for further research and intervention. A 24-page bibliography is included.