A program is presented which had as its objectives the design, assembly and delivery of analytic tools to be used in regional and national air pollution planning and management. The Cost/Benefit model described here completes a set of computer programmed air pollution analysis tools previously conceived. The completed project combines the results of systems analysis with cost/benefit analysis. A description is given of the programmed Benefits Model Segment, a user's manual, and the results of a study which was conducted to illustrate the operation characteristics of the Cost/Benefit Model. The various component modules of the Implementation Planning program and the Benefits model segment are presented. Also included is a presentation of the model demonstration in the National Capitol Interstate control region.