“…To illustrate Wilson's (1994) argument, one might contrast the theoretical versus empirical work on the transtheoretical (i.e., "stages-of-change") model of change and its applicability to obesity treatment. Despite the mounting number of theoretical discussions (e.g., Brownell, 1995;Clark, Pera, Goldstein, Thebarge, & Guise, 1996;Rossi, Rossi, Velicer, & Prochaska, 1995), relevant data are extremely limited (e.g., Carlson, Sonnenberg, & Cummings, 1994;Fontaine, Cheskin, & Allison, 1997;O'Connell & Velicer, 1988;Prochaska, Norcross, Fowler, Follick, & Abrams, 1992). Moreover, the data that do exist generally do not support the predictive validity of the models (e.g., Fontaine et al, 1997).…”