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This study explores the role of the motivational self-regulation in academic procrastination under the personality framework. Therefore, the aims of the study were to investigate: (a) the role of personality dimensions in the self-regulation of motivation; (b) the role of self-regulation of motivation in procrastination; and (c) the mediating role of the self-regulation of motivation. The participants were 274 university students (M ¼ 21 years). The Big Five traits explained from 6% to 17% variance of the individual motivational regulation strategies (MRSs). Both personality (conscientiousness) and the MRS (environmental control) were significant predictors of academic procrastination. Conscientiousness, agreeableness, and intellect showed an indirect effect on reducing academic procrastination, mediated through the strategy of environmental control, thus additionally suggesting the important role of this motivational strategy. Since this strategy can be taught, these findings have a strong practical value.

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The present study examined the role of sensation seeking (SS) in different types of delinquent behavior across sex, controlling for the Big Five personality dimensions. The sample of Croatian adolescents comprised 117 boys and 137 girls. As predicted, SS was the central explanatory variable beyond the Big Five dimensions in both the boys’ and girls’ normative antisocial behavior, minor delinquency, and overall delinquency. In only the girls, SS was also a risk factor for serious and violent delinquency along with extraversion and emotional instability. In both sexes, the explanatory power of SS decreased as the severity of the offenses increased. The results underscore the significance of SS in normative and minor types of adolescent delinquency and indicate a different etiology of normative adolescent delinquency from severe and violent delinquency. The results also suggest a different constellation of personality risk factors for boys and girls for each different type of delinquency.

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