"This document offers a practical guide on how to design behaviorally-informed communications and interventions that help contain the spread of Covid-19. How and with what resources should you communicate to overcome the deep behavioral biases that we all have and that are heightened in situations of stress, fatigue, and uncertainty? How do you encourage people to heed health recommendations upon returning to their workplaces or schools? This guide helps answer these questions and offers clues and concrete examples of how communications can promote behavior change." (Abstract)