Since CAI was introduced, the course author has been faced with a new problem. Not only must he have a thorough knowledge of the subject content and the student objectives for the course but he must also learn an instructional programming language. This paper discusses the various types of easy author entry systems that have been developed, describing the salient features of particular systems, and suggests where each type might be used. It also describes a prototype system whose design aims have concentrated particularly on the problems of ease of use, documentation and standardization. © 1974, Academic Press Inc. (London) Ltd.. All rights reserved.