providing a place to drink without interference by adults and company to drink with. A few studies have begun to address exposure-related mechanisms (e.g., Burk et al., 2012; Molloy, Gest, & Rulison, 2011), but progress will probably require more detailed information about the nature and content of friendship relationships, as well as the individual characteristics that may be changed by exposure to drinking peers and possibly mediate the likelihood of first use (e.g., self-concept; Molloy et al., 2011). The SABM framework can, in principle, model many such mechanisms as coevolving dynamic systems, simultaneously in the same model, if suitable data are available (cf. Snijders, Lomi, & Torló, 2012).
