“…This observation has led to enduring interest in understanding how different treatments could be more optimally allocated to those individuals most likely to benefit (Andrews, Bonta, & Wormith, 2006;Brown, Seraganian, Tremblay, & Annis, 2002a, 2002bIsenhart, 1994;Litt, Babor, DelBoca, Kadden, & Cooney, 1992;Tonigan, 2003). Nevertheless, in the substance abuse treatment field, where client-treatment matching has been an active research topic, considerable uncertainty still exists concerning how specific interventions work and how they may interact with individual characteristics to produce their outcomes (Duvall, Oser, & Leukefeld, 2008;UKATT Research Group, 2005;Field, Baird, Saitz, Caetano, & Monti, 2010;Morgenstern & McKay, 2007;Orford et al, 2009;Tober, Clyne, Finnegan, Farrin, & Russell, 2008;Vasilaki et al, 2006;Witkiewitz, Hartzler, & Donovan, 2010). With few exceptions (e.g., Wells-Parker, Dill, Williams, & Stoduto, 2006;Wells-Parker, Kenne, Spratke, & Williams, 2000), our knowledge of specific intervention responsivity to intervention in the DWI population is lacking.…”