8 February 2021 This document highlights 10 well established Risk Communication and Community Engagement (RCCE) principles that have proven their power. Together they put communities at the heart of the roll out of new vaccines, treatments and tests and promote trust, the critical ingredient for all community action. Informed, engaged and empowered communities are the bedrock for the arrival of new vaccines, treatments and tests that will be introduced to reduce the spread of COVID-19 and save lives. With communities fully engaged and actively participating through the full cycle of planning, delivery and assessment for biomedical tools, demand for these tools can be increased, leading to widespread and effective uptake and use