This document describes the computer program and serves as a user's manual for a numerical model on THE PREDICTION OF POLLUTANT FORMATION IN DIESEL ENGINES. The model is capable of predicting both engine performance and formation of nitric oxide and soot in a direct injected diesel engine combustion process. The program is sufficiently versatile to investigate the influence of several engine parameters, such as geometry, injection timing, compression ratio, load, swirl, etc., and thus can be considered as a tool readily accessible to the design engineers. The physical and chemical processes, the detailed mathematical analysis and the assumptions upon which the model is based are discussed in the full report on this investigation. This manual contains brief descriptions of the program subroutines, program input and output. One sample case is also given to illustrate the use of the program which is designed to facilitate program check-out. The computer program is coded in standard FORTRAN IV, and a version is currently operational in CDC 6600 computer.