The WSSCC Community of Practice on Sanitation and Hygiene in Developing Countries (WSSCC CoP) and the global Sustainable Sanitation Alliance (SuSanA) came together in late September 2015 to hold a joint three-week thematic discussion on sanitation and hygiene behaviour change programming and sustainability. It was the first time the two networks had come together to host an online collaborative learning event. Both platforms have over 5,000 members each working in WASH and other related sectors. Hence, this thematic discussion was an opportunity to bring together these two global communities to share learning and to explore links between research and practice on behaviour change. The focus on sanitation as a business and sanitation entrepreneurs has mushroomed in recent years with numerous organisations (donors, research institutes and think tanks, NGOs, and impact investor / philanthropist foundations, amongst others) exploring the topic. This summary blends the discussions online with a sampling of the numerous resources available on the topic.