Despite widespread application of developmental assessment centers (DACs), little is known about the impact of the process on participants' understanding of the assessed performance dimensions. This study explores this issue by applying Golembiewski, Billingsley, and Yeager's (1976) tripartite model of change to assess the presence of alpha, beta, and gamma change in DAC participants. Using the method outlined by Terborg, Howard, and Maxwell (1980), we investigate the nature and type of change occurring in a sample of mid-level managers following a DAC. Evidence for all three types of change was found across the six dimensions targeted by the DAC. Results suggest DACs may not only be an effective means to facilitate perceived performance improvement (alpha change), they may also succeed in facilitating new insight in participants regarding the dimensions on which they are assessed (beta and gamma change). (Contains 4 tables.)