This is the Spanish version of the November 2011 edition of Bernard Van Leer's "Early Childhood Matters" series. It looks at the question of how to scale up early learning provision without sacrificing quality. Articles consider lessons that can be learned from national-level experiences in South Africa, Kenya, the US, the UK, Macedonia, Cuba, Chile and Peru, and examines lessons at an organisational level with input from Reggio Emilia in the US, among others. Other articles discuss what "quality" means in the context of early education services, outline the World Bank's new tool to collect evidence on what works, and analyse how interactive technology can help to scale up early learning.