At this point in the inquiry relation had established itself between the "interview programme" and the results obtained in the experimental rooms. The source of those constraints, relief from which the relay assemblers had so freely expressed, had, at least in part, revealed itself. Human collaboration in work, in primitive and developed societies, has always depended for its perpetuation upon the evolution of a non-logical social code which regulates the relations between persons and their attitudes to one another. Insistence upon a merely economic logic of production-especially if the logic is frequently changed-interferes with the development of such a code and consequently give rise in the group to a sense of human defeat. This human defeat results in the formation of a social code at a lower level and in opposition to the economic logic. One of its symptoms is "restriction". In its devious road to this enlightenment, the research division had learned something of the personal exasperation caused by a continual experience of incomprehension and futility. It had also learned how serious a consequence such experience carries for industry and for the individual.