In order to accelerate progress on undernutrition reduction we need to understand how the governance of nutrition programmes leads to successful outcomes. Based on evidence from six countries: Bangladesh, Brazil, Ethiopia, India, Peru and Zambia, this briefing informs government leaders, policymakers and key stakeholders of the Scaling Up Nutrition movement: how they can better mobilise political commitment for undernutrition reduction and how they can facilitate cooperation across national and local institutions, and among nutritionists, civil society and the private sector.