ABSTRACT
Moderation is central to research in the organizational and social sciences. Moderation occurs when the relationship between an independent variable and dependent variable depends on the level of a third variable, usually called a moderator variable* (Aiken & West, 1991; Cohen, 1978). Moderation is involved in research demonstrating that the effects of motivation on job performance are stronger among employees with high abilities (Locke & Latham, 1990), the effects of distributive justice on employee reactions are greater when procedural justice is low (Brockner & Wiesenfeld, 1996), and the effects of job demands on illness are weaker when employees have control in their work environment (Karasek, 1979; Karasek & Theorell, 1990).
