Microcomputers have in recent years become economical for any small business and/or individuals. With their ease of operation, high speed, flexibility, and low cost these units provide the engineer with an extremely valuable tool that enables him to perform the most complex engineering calculation and enhances his ability to make optimization studies of all types with ease. Typical computer systems highlighting the state of the art with recommended features for maximum utilization by engineers are described. Also discussed are programs for calculations such as short circuit, load flow, motor acceleration, voltage drop, sag and tension for overhead distribution, and others. Program development for the small computer is limited only by the resourcefulness and imagination of the user. It is expected that in time these units will become as common in the industry as the slide rule or the programmable calculator.