Child development has traditionally been one of the foundations for primary education and particularly for early childhood education and the education of children with special educational needs. The focus has been on the work of Piaget, who identified broad stages of development through which all children are likely to pass, although not necessarily at the same rate, and on their implications for teaching and learning. This emphasis on the individual child complements other aspects of primary teaching such as classroom management, which focus on children as members of teaching groups.