Fig. 2From: Crowdsourcing to promote HIV testing among MSM in China: study protocol for a stepped wedge randomized controlled trialSchematic of crowdsourcing intervention development and implementation. The block diagrams describe the steps for intervention development and implementation. The text also highlights how crowd contribution will be sustained. Intervention development consists of the crowdsourcing contest followed by the designathon. Intervention implementation will take place at the individual level and community level, with crowd feedback from the designathon. *Crowdsourcing contest solicits concepts or images for promoting HIV testing and produces winning entries selected by the crowd and expert judges. **Designathon adopts the concept of a hackathon and allows diverse individuals to intensely collaborate on designing a comprehensive HIV test promotion campaign. CDC Chinese Center for Disease Control and Prevention, CBO community-based organization, SMS short message service textBack to article page