One clear goalThe learner sees one mission goal before any controls compete for attention.
Visible first actionThe first action is obvious, clickable/touchable, and visibly changes state.
Three meaningful decisionsThe mission requires at least three choices where different reasoning produces different outcomes.
Misconception trapThe sim includes a likely misconception and captures evidence when the learner falls into or avoids it.
Revision opportunityThe learner can revise after observing consequences instead of being graded only on first output.
Transfer promptThe learner applies the same reasoning to a new context before completion.
Teacher-readable evidenceTeacherOS can summarize prediction, action, observation, explanation, revision, and transfer.
Teacher value contractThe sim must resist cheating, reduce burnout, reduce grading time, maximize screen-time value, and support misconception-cluster feedback.
Teacher source controlTeacher-provided sources, datasets, documents, and research constraints must be preserved in the mission contract.
TeachProof recommendationTeacherOS/TeachProof must recommend how the classroom simulation should have been run based on observed student events.
Grade-appropriate shellThe selected shell changes language density, controls, read-aloud, and scaffolding by grade band.
Accessibility baselineThe experience is Chromebook-safe, keyboard reachable, reduced-motion aware, and readable.
Visual distinctivenessThe sim is not a reskin: objects, controls, mission art, and success state are domain-specific.