In three experiments, learning performance in a 6-or 7-week cognitive-science based computer-study programme was compared to equal time spent self-studying on paper. The first two experiments were conducted with grade 6 and 7 children in a high risk educational setting, the third with Columbia University undergraduates. The principles the programme implemented included (1) deep, meaningful, elaborative, multimodal processing, (2) transfer-appropriate processing, (3) selfgeneration and multiple testing of responses, and (4) spaced practice. The programme was also designed to thwart metacognitive illusions that would otherwise lead to inappropriate study patterns. All three experiments showed a distinct advantage in final test performance for the cognitive-science based programme, but this advantage was particularly prominent in the children.A basic foundation for school accomplishment is the availability of higher order cognitive and metacognitive competencies to realistically assess one's knowledge, to allocate and organise study time and effort optimally, to apply cognitive principles (such as deep, elaborative rehearsal, self-generation, testing, and spacing of practice, to name just a few) that effectively enhance learning, and to resist the distractions that could undermine even the most sincerely endorsed intentions. In the population that we targeted in this research, a population of middle school children in an at-risk school setting, these competencies were strikingly limited. Their enhancement was the primary objective of this research. In addition, even among sophisticated learners, specific limitations exist in the use of certain metacognitive strategies. Children and adults often think they know things when they do not (see Metcalfe, 1998;Rawson & Dunlosky, 2007 this issue), and hence inappropriately terminate self-controlled study efforts, or otherwise study in a manner that fails to optimise learning (Bjork, 1994). We sought to devise a computerassisted study programme, based on principles of cognitive science, that would allow such metacognitive illusions to be overcome.The project reported here focused on memory enhancing principles derived from experimental studies in cognitive science. Most of these principles, because they have been studied primarily with a focus on understanding the mechanisms underlying memory and cognition, rather than on efforts to facilitate children's academic success, have been investigated in single-session experiments with scholastically irrelevant materials with college-student participants. Despite the apparent lack of connection of this cognitive science literature to real problems that children Correspondence should be addressed to Janet Metcalfe,