In the PIES model, which element is responsible for starting the sequence of events?

• A. Initiator
• B. Explosive
• C. Power Source
• D. Switch

Answer: (A)

In the PIES model, the sequence of events is triggered by the initiator. The initiator is the component designed to deliver a precise impulse that starts the chain reaction inside the system. The power source provides the energy that can power the whole setup, and the switch serves as a control to connect or disconnect that energy, but neither by itself starts the event. The explosive is the material that undergoes rapid release once it’s been set in motion by the initiator. So the initiator is the element that actually starts the sequence.