Decades of empirical studies from a variety of academic disciplines confirm that social context is instrumental in facilitating or inhibiting the successful dissemination and implementation of innovations. Innovations are ideas, objects, or practices that are perceived as new by members of a given social context (Rogers, 2003). Social contexts are identifiable, interpersonal networks of individuals characterized by stable, predictable patterns (e.g., routines, norms) that prompt, direct, encourage, and constrain individual behavior (Katz & Kahn, 1978; Rogers, 2003). The social contexts in which individuals are embedded and interact shape their perceptions, behaviors, and attitudes in ways that influence their adoption and implementation of innovations (Bandura, 1986; DiMaggio, 1997; Fiske & Taylor, 1991; Hatch, 2004; Rogers, 2003; Scott, 2008; Strang & Soule, 1998). A number of mechanisms account for the effect of social context on individual behavior, including learning, mimicry, sanctions, identity information, competition, schema formation, and meaning construction (Bandura, 1986; DiMaggio, 1997; Scott, 2008; Strang & Soule, 1998). These processes explain within-network similarity and between-network variation in the diffusion of innovative technologies, the nature of their use (i.e., fidelity, adaptation), and their level of assimilation into the ongoing routines of a social system (Greenhalgh, Robert, MacFarlane, Bate, & Kyriakidou, 2004; Robert, Greenhalgh, MacFarlane, & Peacock, 2009). More than 50 years ago, Katz (1961, p. 72) summarized the importane of social context to dissemination and implementation research: "It is as unthinkable to study diffusion without some knowledge of the social structures in which potential adopters are located as it is to study blood circulation without adequate knowledge of the veins and arteries."