“…Since we examined physicians' anticipated responses to a newly available genetic test rather than adoption of a currently available test, we relied on realistic scenarios describing characteristics of a new test to tailor smoking treatment to assess physicians' anticipated take-up rates for such a test. While previous work has validated the use of physician selfreported data, and the use of clinical vignettes or scenarios in particular, as reliable proxies for physicians' actual past behavior (Carey & Garrett, 1996;Mandelblatt, Berg, Meropol, Edge, Gold, Hwang, & Hadley, 2001;Peabody, Luck, Glassman, Dresselhaus, & Lee, 2000), other studies have documented the tendency of physicians to overestimate their selfreported provision of preventive, health promotional services (Leaf, Neighbor, Schaad, & Scott, 1995;Montano & Phillips, 1995;Roter & Russell, 1994). The validity of physicians' self-reported likelihood of future behavior has not been assessed and is an important area for future research.…”