“…For more than 25 years, a small but growing group of behavioral scientists have developed theoretical models and gathered data on a family of normative behavioral practices and procedures referred to as "cumulative-hierarchical learning" (CHL). Central to CHL is the question of how higher-level behavioral patterns and structures can emerge from interactions among a set of lower-level actions (Casti, n.d.;Hawkins, Anderson, & Eifert, 1998;Staats, 1975Staats, , 2003. Proponents of CHL stress the significance of pivotal response interventions (i.e., interventions that impact multiple and important target behaviors) (Humphries, 2003;Koegel & Koegel, 1995;Koegel, Koegel, Harrower, & Carter, 1999;Koegel, Koegel, Shoshan, & McNerney, 1999), behavior repertoires, and generative learning.…”