This study investigated ways of using computer-based learning activities to complement curriculum practices in preschool programs with an early intervention component through the use of computer-based learning activities. Particular attention was given to supporting the development of young children's early mathematical skills. The study took place in a preschool center in the Illawarra region of New South Wales that served at-risk children and families in crisis. The focus of the study was on teaching methodologies and learner experiences that were likely to develop the skills necessary for successful integration into formal schooling. Participants were 11 students (6 in the experimental group and 5 in the control group) who had difficulty in using language fluently and effectively in a range of situations; were unable to persevere with tasks and activities; lacked purposefulness, imagination, and variety in play; lacked initiative; and lacked normal social skills and emotional maturity. Children in the experimental group took part in 7-12 sessions at a computer over a 6-8 week period. Total computer time ranged from 140 to 240 minutes. Paired control group subjects had access to nonmathematical computer-based activities. Findings indicated that experimental group subjects gained dramatically and significantly in mathematical skills and understanding. Appendices include the pretest and posttest, descriptions of software used in the study, and criteria for evaluating early childhood software. (RH)