 Based on this data, Barker first developed the concept of the behavior setting to help explain the interplay between the individual and the immediate environment.Possibly one of the most valuable developments of Barker's work was the examination of the way in which the number and variety of behavior settings remains remarkably constant even as institutions increased in size.This was explored in his seminal work with Paul Gump published as Barker, R. and Gump, P. (1964) "Big School Small School", Stanford