Intended for use by both producers and evaluators of textbooks and other print instructional materials, this review of the literature focuses on the effectiveness of illustrations for motivation and for learning, and such typographical variables as readibality, legibility, standard typographical conventions, and format and layout. Areas examined include the effects of the presence or absence of illustrations; the effects of illustrations on recall; readability as a function of visual factors; legibility, including type size and typeface, leading and line width, ink and paper color, and aesthetics; justification; cuing by means of headings, underlining, and questions; paragraphs and column format; vertical typography and segmentation; and format and layout. A bibliography of sources cited is provided. (BBM)