A large magnitude Cascadia Subduction Zone fault earthquake and tsunami is perhaps one of the most complex disaster scenarios that we face as emergency management and public safety officials in the Pacific Northwest. Due to this complexity, life-saving and life-sustaining response operations will hinge on the effective coordination and integration of governments at all levels – cities, counties, state agencies, federal departments, the military, and tribal nations – as well as non-governmental organizations and the private sector. It is this joint-operational whole community approach that we seek to enhance and test during the Cascading Rising exercise.