In April 2018, almost 1,200 people gathered in Indonesia for the Summit on Behaviour and Social Change Communication. Practitioners, researchers, donors, and leaders  from more than 400 organisations travelled to Nusa Dua from the Asia Pacific region, Africa, Europe, Latin America, and North America. This issue features ten papers prepared by SUMMIT participants based on their presentations. They cover a range of challenges from using story-telling to help fishermen in Belize deal with threats to their occupations, and influencing adolescent girls and boys in India to address gender discrimination and stereotyping – to the use of social media to change norms regarding babies’ health in Malawi.