What are the three phases of the domino theory?

What are the three phases of the domino theory?

• A. Beginning, middle, end.
• B. Pre-accident, during, post-accident.
• C. Pre-contact, contact, post contact.
• D. Initiation, escalation, resolution.

Answer: (C)

The idea behind the domino theory in safety is that an incident unfolds in stages around the moment a hazard interacts with a worker, so you can intervene at different points to stop the accident from happening or repeating. The three phases are pre-contact, where hazards exist and preventive measures should stop exposure before any contact occurs; contact, when the hazard actually touches the worker and controls, PPE, and safe work practices must prevent injury; and post-contact, the aftermath that includes injury assessment, medical treatment if needed, reporting, and corrective actions to prevent recurrence by addressing the root causes. This framing helps you see where to apply controls—remove hazards before contact, ensure proper contact prevention, and learn from the post-contact phase to improve safety. The other phrasings describe timelines or general stages but don’t map as directly to the practical focus of preventing or mitigating involvement at the moment of contact.

The idea behind the domino theory in safety is that an incident unfolds in stages around the moment a hazard interacts with a worker, so you can intervene at different points to stop the accident from happening or repeating. The three phases are pre-contact, where hazards exist and preventive measures should stop exposure before any contact occurs; contact, when the hazard actually touches the worker and controls, PPE, and safe work practices must prevent injury; and post-contact, the aftermath that includes injury assessment, medical treatment if needed, reporting, and corrective actions to prevent recurrence by addressing the root causes. This framing helps you see where to apply controls—remove hazards before contact, ensure proper contact prevention, and learn from the post-contact phase to improve safety. The other phrasings describe timelines or general stages but don’t map as directly to the practical focus of preventing or mitigating involvement at the moment of contact.