The early childhood period is a critical window of opportunity in children’s brain development. Early care, stimulation and learning opportunities give children a better chance for success in school and in life. It is clear that quality early learning opportunities help shape a child’s lifelong capacity for learning, but understanding which approaches work best in varied contexts across low and middle-income countries (LMICs) remains limited. More global knowledge is required. “Collaborative Change” demonstrates how practitioners, researchers and policy makers use the International Development and Early Learning Assessment (IDELA) to work toward the collective goal of improving the lives of young children.