Practice Calibration
Use this after attempting independent practice. These are calibration notes for the new cases, not answers to every original open-ended project. The module assessment retains its own scoring and evidence requirements.
Prerequisite calibration
Check the invariant before publication; reservation above available capacity is rejected with unchanged state. Repair failure-atomic contracts.
A ready answer includes the example or trace requested in the entry check. A memorized term is not sufficient. Repair the named earlier skill, then change the example and explain it without this page.
Case A
The decision and update must be coordinated at the consistency boundary; naming a class Aggregate does not serialize competing writes. State persistence/concurrency assumptions.
Full practice credit requires the result, assumptions and an explanation of the tempting error. A correctly guessed conclusion without those elements is only partial evidence.
Case B
Translate explicit meaning and valid states, not just rename fields. Preserve unknown/unmapped status as an explicit error or state rather than silently guessing.
The key judgment is which guarantee survives the changed condition. Do not transfer a result from the first case without checking that condition.
Experiment calibration
Use the reservation-domain kit, language examples and actual persistence conflict case. Retain model invariants, translation tests, accepted/rejected transitions and a changed business rule.
A usable record links the hypothesis to the actual input, observation and interpretation. The negative control must fail for the intended reason, and the repaired setup must pass the relevant check again. Report unexpected outcomes rather than altering the hypothesis afterward. Explicitly state the model, environment and untested boundary; passing a small fixture never proves every deployment behavior.
Recheck
Explain a fresh variant without the key. Retain the original error, repair, help received and delayed result in the existing evidence packet. Self-calibration is not an independent reviewer sign-off or a learner-pilot result. For retrieval-question explanations, use quiz calibration only after attempting the quiz.