Relationships between locus of control and components of an equation of instrumentality theory for predicting academic performance were examined. It was demonstrated that: (a) locus of control significantly correlated only with the Expectancy component, such that internals tended to perceive a stronger relationship between individual effort and academic performance; (b) locus of control moderated the relationship of instrumentality predictor and performance, with significant prediction being achieved for internals but not externals; and, (c) internals evidenced somewhat less fluctuation in perceptions of Expectancy over time.
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