The Domino Theory is based on three phases:

The Domino Theory is based on three phases:

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

Answer: (B)

Accidents unfold as a chain of events that happen in stages around the moment a hazard is encountered. The three phases describe the timeline from before the hazard interacts with a person, through the moment of contact, to what happens after the incident. Before contact, factors in the environment, equipment, and people create exposure to the hazard. During contact, the hazardous interaction occurs, and if controls fail, an incident can happen. After contact, the consequences are realized and actions such as treatment, investigation, and preventive measures begin to stop a recurrence. This sequencing—before the interaction, the moment of interaction, and after the interaction—best fits the idea of the domino chain in the theory. The other options describe broad or unrelated life-cycle stages and don’t specifically capture the timeline around the hazard interaction.

Accidents unfold as a chain of events that happen in stages around the moment a hazard is encountered. The three phases describe the timeline from before the hazard interacts with a person, through the moment of contact, to what happens after the incident. Before contact, factors in the environment, equipment, and people create exposure to the hazard. During contact, the hazardous interaction occurs, and if controls fail, an incident can happen. After contact, the consequences are realized and actions such as treatment, investigation, and preventive measures begin to stop a recurrence. This sequencing—before the interaction, the moment of interaction, and after the interaction—best fits the idea of the domino chain in the theory. The other options describe broad or unrelated life-cycle stages and don’t specifically capture the timeline around the hazard interaction.