This article documents differences in cognitive development, as measured by the Peabody Picture Vocabulary Test (PPVT), between children from households with high and low socioeconomic status (SES) in two different phases of early childhood in four developing countries. A large number of potential mediators, such as urban residence, preschool…

There has, in recent years, been a reemergence of interest in the early years and a renewed emphasis on the importance of early education programs to ensure that all children start school ready to learn. At the same time, the move toward evidence-based policy development has led to the need to demonstrate the effectiveness of early education…