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This questionnaire is derived to evaluate Karasek's Job Strain Model. He postulated that dimensions of job demand: high demand implying the need to work quickly and hard, and decision authority, defined as the level of control over work, and skill discretion, such as variety of work and opportunity for use of skills impact on health. Decision authority and skill discretion can be combined as decision latitude. Karasek suggests that the worst combination for health is work characterized by high demands with low decision latitude.