CHST question of the day · 14 November 2026

Today's CHST practice question

Safety Program Development, Implementation, and Sustainment

An investigation of a roof fall lists four separate weaknesses: a skylight cover removed for a delivery, a late guardrail order, a pre-task plan that skipped the roof, and a spotter called away. It finds no single person or act to blame. Which model is the investigator most likely using?

The domino model, with one unsafe act starting a chainThe Swiss cheese model, with holes in layered protectionsThe hierarchy of controls, ranked from most to leastThe Pareto principle, with a few causes doing most of the harm

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Today's CHST practice question

An investigation of a roof fall lists four separate weaknesses: a skylight cover removed for a delivery, a late guardrail order, a pre-task plan that skipped the roof, and a spotter called away. It finds no single person or act to blame. Which model is the investigator most likely using?

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