This document discusses how to develop effective messages to persuade audiences and promote behaviors. It explains that a message is meant to benefit the audience and encourage action, not just provide facts. An effective message should give facts to inform, make audiences believe and feel to inspire, and call the audience to a specific action. The document then provides examples of breaking down barriers to a behavior, identifying related benefits, and crafting calls to action and slogans to promote testing for STIs. Overall, the key to an impactful message is to inform, inspire and encourage the audience.