“…Specifically, in order to more firmly establish the psychometric properties of these instruments, predictive validity correlations based on longitudinal research designs would appear to be a logical next step. A number of longitudinal studies of homeless people have recently been completed or are now under way (e.g., Cohen, Mowbray, Bybee, Yeich, Ribisl, & Freddolino, 1993;Koegel & Burnam, 1994;Shinn, 1996;Toro et al, 1997b;Wright, Allen, & Devine, 1993; also see Stojanovic, Weitzman, Shinn, Labay, &Williams, 1999 andZlotnick, Robertson, &Lahiff, 1999, both in this issue). Such studies will be able to explore the role of social support over time, thereby helping to untangle the correlational findings obtained here and in most other studies on social support.…”