In recent years, the principal's ability in managing the school is regarded the critical factor for enhancing the quality of education of each school. This study examine the principal's job competencies and the difference in the order of priority of those job competencies between groups (elementary vs secondary). For this purpose, this study used literature review, nominal group technique, the Locus Focus Model, Borich priority formula. Through the literature review and nominal group technique, 25 job competencies were found for the school principals. The participants confirmed the statistically significant difference between current level and future needed level for those all 25 job competencies. Also, the differences were confirmed between elementary and secondary principals in perceiving the priority of job competencies. Some implications for researchers and practitioners, as well as limitations, are presented.