This booklet, which is part of a series of guidelines for national managers of Health Learning Materials projects participating in the World Health Organization's Interregional Health Learning Materials Programme, is intended to help trainers of health personnel recognize and learn to avoid some of the common pitfalls in producing educational materials. Guidelines are provided for developing health-related instructional materials that are relevant, appropriate, usable, accessible, actually used, and adequately evaluated. Concluding the booklet is a series of rules to follow to ensure that instructional materials are both usable and used. (MN)