“…Because institutions calling themselves residential treatment centers varied enormously in size, populations served, and services, Petti (1980) observed, “There is no typical residential center and no general agreement as to what defines a residential center” (p. 209). In addition, the programs in these facilities were increasingly heterogeneous as behaviorist (Blasé, Fixen, Freeborn, & Jaeger, 1989; Browning & Stover, 1971; Cohen & Filipizak, 1971; Pizzat, 1973), group process (Brendtro & Wasmund, 1989; Vorrath & Brendtro, 1974), psychoeducational (Lewis & Lewis, 1989), and other models (Lyman, Prentice-Dunn, & Gabel, 1989; Wilson & Lyman, 1983) were introduced and little attention was given in the literature to general concepts that encompassed these diverse programs. At best, most residential programs would describe themselves as doing “milieu therapy” and “life-space interviews,” but such ideas were seldom defined or applied in rigorous ways (Whittaker, 1970).…”