One may generalize upon these processes in terms of group equilibrium. The group may be said to be in equilibrium when the interactions of its member… - William Foote Whyte

The corner-gang structure arises out of the habitual association of the members over a long period of time. The nuclei of most gangs can be traced back to early boyhood, when living close together provided the first opportunities for social contacts... The gangs grew up on the corner and remained there with remarkable persistence from early boyhood until the members reached their late twenties or early thirties. In the course of years some groups were broken up by the movement of families away from Cornerville, and the remaining members merged with gangs on near-by corners; but frequently movement out of the district does not take the corner boy away from his corner. On any evening on almost any corner one finds corner boys who have come in from other parts of the city or from suburbs to be with their old friends...

Full-time participant observation over an extended period of time tends to be an age-graded phenomenon. Such studies are most likely to be done by young people, in our student years. When we are established professionals, with teaching or other professional responsibilities, we are unlikely to have the time and the motivation to make such a full commitment.

Each member of the corner gang has his own position in the gang structure. Although the positions may remain unchanged over long periods of time, they should not be conceived in static terms. To have a position means that the individual has a customary way of interacting with other members of the group. When the pattern of interactions changes, the positions change. The positions of the members are interdependent, and one position cannot change without causing some adjustments in the other positions. Since the group is organized around the men with the top positions, some of the men with low standing may change positions or drop out without upsetting the balance of the group. For example, when Lou Danaro and Fred Mackey stopped participating in the activities of the Nortons, those activities continued to be organized in much the same manner as before, but when Doc and Danny dropped out, the Nortons disintegrated...