This approach has the advantage of opening diffusion research to other approaches that work based on binary variables, such as Social Network Analysis or the Theory of Planned Behavior. For example, Social Network Analysis (SNA, Coleman, Katz & Menzel, 1957; Valente, 2006) helps to trace the channels through which innovations spread within interpersonal networks. Behavioral theories from social psychology, such as the Theory of Reasoned Action (TRA, cf. Fishbein & Ajzen, 1975) and the Theory of Planned Behavior (TPB, cf. Ajzen, 1985), facilitate the modeling of factors that influence the individual’s adoption decision.