Series of events or decisions that may be considered.

Having identified the hazards, the possible major impacts of each are itemized, such as:

• Sequential events (for example, a fire after an explosion).
• Evacuation.
• Casualties.
• Damage to plant infrastructure.
• Loss of vital records/documents.
• Damage to equipment.
• Disruption of work.

Based on these events, the required actions are determined. For example:

• Declare emergency.
• Sound the alert.
• Evacuate danger zone.
• Close main shutoffs.
• Call for external aid.
• Initiate rescue operations.
• Attend to casualties.
• Fight fire.

The resources that may be required and their location are considered, such as:

• Medical supplies.
• Auxiliary communication equipment.
• Power generators.
• Respirators.
• Chemical and radiation detection equipment.
• Mobile equipment.
• Emergency protective clothing.
• Fire fighting equipment.
• Ambulance.
• Rescue equipment.
• Trained personnel.