Another important figure to the origin of school psychology was Granville Stanley Hall. Rather than looking at the individual child as Witmer did, Hall focused more on the administrators, teachers and parents of exceptional children[17] He felt that psychology could make a contribution to the administrator system level of the application of school psychology.[17] Hall created the child study movement, which helped to invent the concept of the "normal" child. Through Hall's child study, he helped to work out the mappings of child development and focused on the nature and nurture debate of an individual's deficit.[17] Hall's main focus of the movement was still the exceptional child despite the fact that he worked with atypical children.