Discusses text displayed on computer screens and examines the effects of three layout variables--justification, line length, and leading--on reading speed and comprehension. Current literature on each variable is reviewed, and implications for the design of computer-based instruction are presented. (Author/LRW)

Discusses text presentation in computer-based instruction and reviews research that has been done in this area. Topics discussed include length of text, amount of text presented at one time, rate of text presentation, color, text comprehension, text structure, reader comprehension, and new directions for computer-based text. (23 references) (LRW)