The concern of computer-aided design (CAD) presented is primarily on the anatomy, rather than the technical content, of engineering programs to run personal computers. The author supplements his own ideas with suggestions by clients and borrows from user-friendly features found in current commercial personal computer software. For the design of small motors, or similar apparatus, the author strongly recommends an interactive approach due to the flexibility and training it offers. He emphasizes how valuable a word processor can be to an engineer for writing, editing, or debugging a Fortran program, or simply for writing a technical report or preparing a paper. >