Abstract
A basic question of instruction is how much students will actually learn from it. This paper presents an approach called learning decomposition, whichdetermines the relative efficacy of different types of learning opportunities. This approach is a generalization of learning curve analysis, and uses non-linear regression to determine how to weight different types of practice opportunities relative to each other. We analyze 346 students reading 6.9 million words and show that different types of practice differ reliably in how efficiently students acquire the skill of reading words quickly and accurately. Specifically, massed practice is generally not effective for helping students learn words, and rereading the same stories is not as effective as reading a variety of stories. However, we were able to analyze data for individual student’s learning and use bottom-up processing to detect small subgroups of students who did benefit from rereading (11 students) and from massed practice (5 students). The existence of these has two implications: 1) one size fits all instruction is adequate for perhaps 95% of the student population using computer tutors, but as a community we can do better and 2) the ITS community is well poised to study what type of instruction is optimal for the individual.
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