“…Second, in gathering references, I was struck by the continued widespread work on generalized causal inference that traces its inspiration at least partly to CCM (e.g., Boruch & Mosteller, 2002; Cook, 2007; McKnight, McKnight, Sidani, & Figueredo, 2007; Reichardt, 2006; Shadish & Rindskopf, 2007) and the continued high number of citations to the key works in CCM. Much of this work was and still is carried out by members of the core theory group that Campbell attracted to Northwestern University (Shadish, Phillips, & Clark, 2003). However, CCM achieved paradigmatic status in part because it attracted so many researchers who were not themselves part of the Northwestern theory group (e.g., Bickman, 2000; Braver & Braver, 1988; Henry & Mark, 2003; Lipsey, 1990; Maxwell, 2003; McKillip, 1992; McKnight et al, 2007; Reynolds & West, 1987).…”