The JCQ is a self-administered instrument designed to measure social and psychological characteristics of jobs. The best-known scales—(a) decision latitude, (b) psychological demands, and (c) social support—are used to measure the high-demand/low-control/low-support model of job strain development. The demand/control model predicts, first, stress-related risk and, second, active-passive behavioral correlates of jobs. Other aspects of work demands are assessed as well: (d) physical demands and (e) job insecurity. The instrument has a recommended length of 49 questions. (author abstract)