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A dilemma faced by teachers, and increasingly by designers of educational software, is the trade-off between teaching new material and reviewing what has already been taught. Complicating matters, review is useful only if it is neither too soon nor too late. Moreover, different students need to review at different rates. We present a mathematical model that captures these issues in idealized form. The student's needs are modeled as constraints on the schedule according to which educational material and review are spaced over time. Our results include algorithms to construct schedules that adhere to various spacing constraints, and bounds on the rate at which new material can be introduced under these schedules. [ABSTRACT FROM AUTHOR]

Presents a mathematical model to explain the small-world phenomenon, the principle that most people are linked by short chains of acquaintances. Investigation of how individuals can find short chains in a large social network; Presentation of a simple network model; Findings of the model.