This practical guide to designing and writing instructional materials has been extensively revised and updated. It particularly emphasizes layout and the visual presentation of text for the purpose of teaching, instructing or directing people. The author stresses the importance of advance planning in the layout of instructional materials.;Decisions such as the choice of page-size, typesize and typeface for clarity, structure and emphasis are discussed in detail and examples of instructional text are provided in "before and after" formats.;The role of illustrations, tables and graphs, and the presentation of quantitative information in diagrams, charts and symbols are also discussed. The book concludes with a discussion of the evaluation of instructional text in terms of content, typography and teaching effectiveness.