The increased use of digital computers in training devices and operational equipment since 1960 has presented many new problems to NTDC. A study of the application of digital computers to training devices and of the experience with these devices in the field has revealed problems in hardware, software and personnel that must be resolved if training devices using digital computers are to satisfy the complex requirements imposed on them. A discussion of some of these problems and a recommendation for a short and long range approach to their solution is presented in this paper.