Take a settlement house in a lower-class slum district trying to wean away teen-agers from the publicly disapproved activities of a juvenile gang. The frame of reference within which social workers and police officers define the “problems” of this situation is constituted by the world of middle-class, respectable, publicly approved values. It is a “problem” if teen-agers drive around in stolen automobiles, and it is a “solution” if instead they will play group games in the settlement house. But if one changes the frame of reference and looks at the situation from the viewpoint of the leaders of the juvenile gang, the “problems” are defined in reverse order. It is a “problem” for the solidarity of the gang if its members are seduced away from those activities that lend prestige to the gang within its own social world, and it would be a “solution” if the social workers went way the hell back uptown where they came from. What is a “problem” to one social system is the normal routine of things to the other system, and vice versa. Loyalty and disloyalty, solidarity and deviance, are defined in contradictory terms by the representatives of the two systems.