Discusses the types of problems that arise when text is presented in electronic form: (1) surface design, which involves typography, layout, graphics and illustrations, and the quality of language; and (2) interface design, which is manifested on the levels of immediate surface of the text, internal structure, and external structure. (SKC)

Hypothesizes that typographic cues structured according to a defined set of common attributes within textbooks enable readers to discriminate between various levels of information and to make generalizations about the information contained in each level. Proposes a method of identifying and ranking categories of information. (KEH)