The work — index of cases
Work
Cases describe transferable thinking — frameworks, artifacts, and decision logic. Names, student data, and proprietary systems are abstracted by design.
Detailed cases — read in full
01A mastery model that survived a real curriculum
How we replaced a checklist of standards with a mastery model that teachers could act on — and that statistics could defend.
Knowledge tracing without the black box
Bayesian Knowledge Tracing made legible to the people who teach and the people who build — not just to the model.
Selected records — abstracted
03An item-validation pipeline teachers trust
Context — a national-assessment context needed items defensible in public. Decision — gate the bank on construct fit, not author confidence. Constraint — finite items, a skeptical review board, zero room for a silent failure. What transferred — an automated check that fails the build when an item’s behavior contradicts its claimed construct, so quality is institutionalized rather than left to vigilance.
Not all cases are equally detailed. The detailed cases are written to be read closely; the records are deliberately compact — enough to show the shape of the decision, anonymized to protect the institutions involved.