SPRING stands for Sustainable Programme Incorporating Nutrition and Games. It is an integrated nutrition and development intervention delivered at scale by community-based agents (CBAs), through monthly home visits from pregnancy through the first two years of life using a cognitive behavioural therapy (CBT) based counselling approach to enhance the likelihood that behaviour change will occur. The impact of the SPRING intervention on child growth and development is being evaluated through parallel cluster randomized controlled trials in India and Pakistan. SPRING is funded through a Wellcome Trust Programme Grant, which includes the development of the SPRING intervention and the impact evaluation. An additional grant from the Strategic Impact Evaluation Fund (SIEF) allows additional data collection on intermediate variables, process and implementation including costs together with additional qualitative and statistical analyses, in order to develop a more detailed understanding concerning how any impacts have been achieved and to inform going to scale with SPRING.