This publication chronicles the events that led to ASEAN historic decision to launch the ASEAN-led humanitarian operation from the perspective of many of the people who figured prominently in the story. Through this publication, we wish to share within and across the region what we have gained from our experience carrying out ASEAN first-ever large-scale humanitarian operation in a Member State. It is our sincere hope that our lessons will be of service to others and our best practices replicated in the event of future disasters.