The primary objective of the study was to project the cost and benefits of CDS. Emphasis was given to the cost and benefits of the interstate exchange of criminal histories. Total CDS requirements were projected, with no attempt to allocate funding between State and Federal agencies. Potential benefits which justify the development of both the criminal history and statistical components of the CDS program were identified. The cost estimate of $555.3 million through 1984 is considered significantly in excess of planned funding levels. These costs, in the opinion of the project team, are higher than necessary to achieve the anticipated benefits. It advises that costs somewhat below or significantly above the projected level may be experienced, depending on future CDS policies. Policies that may affect cost are identified and discussed. Supporting tabular and graphic data are provided. (Author abstract modified)