Learner preferences for varying screen density levels were examined using multiple screen designs (high external validity) and single screen designs (high internal validity). Subjects were 23 graduate and 23 undergraduate student volunteers. When viewing multiple screens for each design in Study I, they indicated the highest preference for medium density screens while tending to select higher-density over lower-density screens in individual comparisons. When viewing only the first screen of each density level in Study II, subjects again expressed preferences for higher-density over lower-density designs. Suggestions are provided concerning the use of realistic and nonrealistic content for the stimulus materials as well as implications of using externally and internally valid screen designs for future research on computer-based screen design. (36 references) (Author/BBM)