Given the critical importance of exercises, UNESCO/IOC has included guidance within its Manuals and Guides Technical Series, entitled “How to Plan, Conduct and Evaluate UNESCO/IOC Tsunami Wave Exercises .” The purpose of this Guideline is to provide a set of generic and consistent advice on exercise development, management and evaluation that will apply to both exercise coordinators and exercise players (tsunami service providers and warning centres), as well as disaster management agencies. The guidance can be used internationally by all Intergovernmental Coordination Groups (ICGs) and provides a step-by-step approach for conducting national to local tsunami exercises in the context of the UNESCO/IOC-coordinated Tsunami Wave exercises. UNESCO/IOC recommends that exercise planners use this guide as a basis for developing and conducting Tsunami Wave exercises.