Whether it's hand hygiene, physical distancing, disinfecting surfaces, wearing masks, or reaching out to protect the most vulnerable, behavior change has a key role to play in tackling the COVID-19 (coronavirus) pandemic. This brief from the World Bank, London School of Hygiene & Tropical Medicine, Harvard Kennedy School and Project Clear provides guidelines and principles to help governments develop national communications strategies for behavior change. It draws from academic literature, recent research, analysis of existing initiatives, and examples from projects across the world to offer 10 essential components for rapidly developing a communications strategy to combat COVID-19.