AbstractThis article deals with the management of instructional developmentprojects for computer-based training (CBT), and is primarily aimed at project managers working with a team of instructional developers for a corporate client. Two issues are discussed: a) estimating the size of a CBT project, and b) performing a cost-benefit analysis. These issues are important for projecting costs, tracking performance and justifying development expenditures.This is a fictionalized case study. The methodology, examples, concepts and estimates are composite sketches drawn from several projects, based upon the author's experiences while working as a CBT project manager. Actual figures and clients have been intentionally obscured to protect the proprietary rights of all parties involved.The reader should be cautioned that the article presents only one approach to project development and estimation. Wholesale application of the approach described is not recommended, as every project will introduce novel interactions of resources and variables which mandate different treatment. Still, it is hoped that the reader will draw upon the ideas presented to refine project management approaches already used.