A novel assessment center (AC) structure that models broad dimension factors, exercise factors, and a general performance factor is proposed and supported in 4 independent samples of AC ratings. Consistent with prior research, the variance attributable to dimension and exercise factors varied widely across ACs. To investigate the construct validity of these empirically supported components of AC ratings, the nomological network of broad dimensions, exercises, and general performance was examined. Results supported the criterion-related validity of broad dimensions and exercises as predictors of effectiveness and success criteria as well as the incremental validity of broad dimensions beyond exercises and general performance. Finally, the relationships between individual differences and AC factors supported the construct validity of broad dimension factors and provide initial insight as to the meaning of exercise specific variance and general AC performance.