Two experiments were performed on two different populations of preschool children with a mean age of 4.5 years. One group was enrolled in a half-day nursery school program and the other attended a full-day program. A microcomputer and age-appropriate software were placed in each classroom according to the following schedule of treatment weeks: baseline, computer-noninteractive (omitted from the second study), computer-interactive, and computer-interactive/teacher-interactive. Children were observed unobtrusively from a position within the computer station. The following behaviors were recorded at 5-minute intervals: (1) child-to-child behaviors, which included positioning for a turn, assisting one another at the computer, enforcement of rules, and domination of the computer; and (2) child-to-computer behaviors, which included object aggression, defending property, key manipulations, and touching the monitor. After the final week, a questionnaire was administered to the children to ascertain the extent of their knowledge, attitudes, and perceptions about their computer experience. It was concluded that preschool children are capable of working with microcomputers and that they can use the standard keyboard with minimal instruction, change software with minimal instruction, and work together at the computer station with minimal teacher supervision. (Author/RH)