A general-purpose optimization program, using the meth ods of steepest descent and multidimensional Newton- Raphson, has been developed for the IBM 7094. The program can be used independently or as part of a man- machine optimization system in which the engineer can quickly appraise the effect of changes in problem param eters. Man-machine interaction at a remote location is provided through an experimental console which con sists of a Packard-Bell PB-250 computer and associated input-output equipment.The program and equipment configuration used for interaction will be described and an example of network optimization using this system will be presented.An optimization scheme which is designed for a digital computer offers a more sophisticated strategy and better accuracy than a scheme designed for an analog computer. The current interaction system is of limited form; never theless, work done with it has aided in defining the ob jectives for a more flexible man-digital machine interac tion system.