The purpose of this study was to compare the concurrent validity of the Battelle Developmental Inventory (BDI) with the Vineland Adaptive Behavior Scales (Vineland) and the Bayley Scales of Infant Development (Bayley). The sample included 67 children with motor delays and a mean aye of 18.63 months. These children were administered either the Vineland, Bayley, and/or the BDI or some combination of all three. As a replication of McLean, McCormick, Bruder, and Burdy (1987), this study revealed similar flndlnys and Indicated that the BDI possessed moderate to hiyh levels of concurrent validity with appropriate subtests from the Vineland and the Bayley.