The majority of research on intrinsic motivation has examined the impact of environmental factors that aroused people's needs for competence and self-determination and their influence on behavior. Relatively less attention, however, has been paid to the identification of psychological individual differences in intrinsic motivation. The present study tested a model in which a personality-based view of intrinsic motivation is prominent. Specifically, we investigated whether two of the Big-5 personality dimensions, conscientiousness and openness to experience, would affect intrinsic motivation. The results indicated that those two personality traits could be significant predictors of intrinsic motivation with the effects of taskrelated motivators (e.g., ability utilization, achievement, task variety, etc.) controlled for. The meaning of the findings and directions for future research are discussed.

Research on the effects of personality on work behaviors has adopted either the motivational meditation perspective or the person-situation interaction perspective. This study attempted to integrate both of the perspectives in a single causal model. Specifically, using data collected from systems engineers and car salespeople in Japan, we investigated the mediating role of intrinsic motivation in the links from openness and conscientiousness to continuous learning, and the moderating role of occupation on the mediation mechanism. The results indicated that, for systems engineers, the effects of those personality traits on continuous learning were completely mediated via intrinsic motivation. For car salespeople, however, the trait effects on the outcome variable are direct, rather than transmitted through intrinsic motivation. The meanings of the findings and directions for future research are discussed.j pr_447 1..14

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