This study investigated the relation of the "Big Five" personality di- mensions (Extraversion, Emotional Stability, Agreeableness, Consci- entiousness, and Openness to Experience) to three job performance criteria (job proficiency, training proficiency, and personnel data) for five occupational groups (professionals, police, managers, sales, and skilled/semi-skilled). Results indicated that one dimension of person- ality. Conscientiousness, showed consistent relations with all job per- formance criteria for all occupational groups. For the remaining per- sonality dimensions, the estimated true score correlations varied by occupational group and criterion type. Extraversion was a valid pre- dictor for two occupations involving social interaction, managers and sales (across criterion types). Also, both Openness to Experience and Extraversion were valid predictors of the training proficiency criterion (across occupations). Other personality dimensions were also found to be valid predictors for some occupations and some criterion types, but the magnitude of the estimated true score correlations was small (p < .10). Overall, the results illustrate the benefits of using the 5- factor model of personality to accumulate and communicate empirical findings. The findings have numerous implications for research and practice in personnel psychology, especially in the subfields of person- nel selection, training and development, and performance appraisal.