The objective of this paper is to investigate the criterion-related validity between the outcomes of an assessment center and the personal annual performance. Most of the previous studies merely focused on the correlation between the assessment outcomes and their performance. It was lack of a deep analysis to explain the trend between the personal annual performance and the assessment outcomes. In this paper, we adopted the assessment outcomes of middle managers from a motorcycle manufacturer as subjects to study the criterion-related validity. The correlation between the personal annual performance and the managerial capability assessment was carefully examined. The results indicated that the correlation between the assessment outcomes and their overall performance was 0.841, and the correlation between the assessment outcomes and their annual performance ranged from 0.679 to 0.755. Moreover, the three managerial capabilities, which indicated empowering, problem solving, and controlling were able to explain 70.1% of total variance. It implied that the three managerial capabilities were effective predicators to their performance later on.