Passenger Evacuation - Memory Item or QRH?

[captjns]

How is the evac signal or PA from the left seat coordinated with other crew members to ensure the engines are shut down before the command to evacuate is given?

The captain tends to his/her immediate action items from memory which would include but may not be limited to, based on the airline specific and aircraft model.

Park Brake – Set
Flaps – XX position (per the procedure specific to the operator and aircraft)
Speed Brake Lever – Forward
Start Levers – Cut Off

Passenger Evacuation – Initiate (this is accomplished with the passenger address microphone).

The Cabin Crew will initiate the evacuation if they do not hear the command from the cockpit within a specified period of time.