This supplement of the key messages for DRR is designed to be a tool for practitioners internationally to use in a consensus-building validation process. The IFRC invites National Societies, National Disaster Management Organizations, non-governmental organizations (NGOs) and inter-governmental organizations (IGOs) to be part of a global validation project with the objective of developing a comprehensive multi-regional set of key messages for the World Congress of Disaster Reduction, marking the culmination of the 2005–2015 Hyogo Framework for Action (HFA). Part 1 introduces the supplement, including the background and processes involved in developing the messages, as well as the purpose, scope and framework. It explains the validation process and sets out a series of participatory and consensus- based processes for that can be used to select, adapt, enrich and expand the set of key messages. Part 2 provides the key messages themselves. Section A sets out the key messages for all-hazards household and family disaster prevention and then Section B presents hazard-specific advice for drought, earthquakes, floods, pandemics, tropical storms and wildfires.