“…Research on mechanisms of change in adolescent treatment may also provide some clues for understanding the relationship between client and therapist behaviors during therapy sessions and positive trajectories of change (Robbins, Alexander, Newell, & Turner, 1996;Robbins, Alexander, & Turner, 2000;Waldron, Turner, Barton, Alexander, & Cline, 1985). For example, some studies have found support for the link between the improvements in family functioning resulting from family therapy and subsequent reductions in adolescent problem behavior (Huey, Henggeler, Brondino, & Pickrell, 2000;Eddy & Chamberlain, 2000), although similar links for substance abuse treatments have yet to be established (Ozechowski & Liddle, 2000;Szapocznik et al, 1989;Waldron, 1998).…”