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This study examined how Supplemental Instruction (SI) visits help traditionally disadvantaged students reduce the performance gap in their courses. A student is defined as holding a "disadvantaged" status when he or she can identify with the following factors: underrepresented minority status, first-generation status, Federal Pell Grant eligible status, and English/mathematics remedial status. This study revealed that students including both disadvantaged and nondisadvantaged would benefit from an increase of SI participation. The more disadvantaged students gained larger performance improvement than less disadvantaged students with more SI visits, indicating the importance of regular SI participation for disadvantaged students to close the performance gap with nondisadvantaged students.

Tests, as learning events, are often more effective than are additional study opportunities, especially when recall is tested after a long retention interval. To what degree, though, do prior test or study events support subsequent study activities? We set out to test an implication of Bjork and Bjork's (1992) new theory of disuse--that, under some circumstances, prior study may facilitate subsequent study more than does prior testing. Participants learned English-Swahili translations and then underwent a practice phase during which some items were tested (without feedback) and other items were restudied. Although tested items were better recalled after a 1-week delay than were restudied items, this benefit did not persist after participants had the opportunity to study the items again via feedback. In fact, after this additional study opportunity, items that had been restudied earlier were better recalled than were items that had been tested earlier. These results suggest that measuring the memorial consequences of testing requires more than a single test of retention and, theoretically, a consideration of the differing status of initially recallable and nonrecallable items.