The central lesson in machine work vs human work failure modes and controls is that a technically accurate output can still produce an operating failure. The system may act on the wrong objective, use data for an inappropriate purpose, cross a decision boundary, or leave a person to absorb consequences they could not prevent. Model quality matters, but it sits inside a larger arrangement of authority, work design, evidence, and recovery.
Start incident review with the work unit rather than the final message. Identify the trigger, intended outcome, source state, machine interpretation, person or policy with authority, executed action, affected people, and observed result. This sequence reveals whether the problem came from capability, configuration, source governance, organizational policy, review capacity, or a missing owner. Different causes require different controls.
A control should change behavior under pressure. A policy document that no permission checks enforce is guidance, not containment. A dashboard without a receiving owner is visibility, not response. A reviewer who cannot access the source or stop the action is present but not governing. Evaluations should test these distinctions with failure cases before they are needed in a live incident.