Tsunamis’ destructive force presents a great risk for lives and livelihoods in the exposed areas in Asia and the Pacific. Considering the infrequent low probability but high consequence – nature of Tsunami, regular exercises are essential to enhance awareness and preparedness of stakeholder agencies, community organizations and citizens groups to work together to prepare for the evacuation after a tsunami warning is issued by national and local authorities. Indian Ocean-wide tsunami exercises, such as the IOWave16 have proven to be effective for evaluating the readiness of the IOTWS and to identify improvements.