When Does an Exposure Gap Matter? A Differential-Exposure Audit of a Spaced-Repetition Scheduler in Two Deployments

Under review. A two-stage audit of late-night practice in two SM-2 deployments, separating differences in response performance from simulated scheduling burden and group exposure.

Authors: Iman YeckehZaare · Year: 2026 · Submitted to: LAK 2027 · Research Full Papers · Submission updated: 2026-09-29

This submitted manuscript estimates within-learner response differences, translates them into simulated scheduling burden, and identifies groups with greater exposure. Applied to late-night practice in two SM-2 deployments, it finds a small, model-dependent university effect and inconclusive platform evidence. Exposure differences alone do not establish unequal harm.

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