The occupational stress indicator locus of control scale: Should this be regarded as a state rather than trait measure?

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Abstract
Robertson et al (1990) concluded that the Occupational Stress Indicator's (OSI) locus of control scale did not have an acceptable level of validity. The present study compared two groups of health service employees, categorized on the basis of their obtained OSI locus of control scale scores as having ‘high’ versus ‘low’ control, on a number of other OSI scales. Subjects who regard themselves as having ‘high’ control reported significantly less work pressure, employed certain coping strategies more frequently, reported lower ill health scores and were more job satisfied. The findings are theoretically consistent with the argument that the OSI locus of control scale is a subjective measure of an individual's appraisal of their control at work (i.e. a state measure) rather than a trait construct as measured by Rotter's scale (as used in the OSI validity study by Robertson et al).