“…Group contingencies have been efficacious in modifying variables such as disruptive behavior, academic achievement, and more recently, homework completion (Murphy, Theodore, Alosio, Alric-Edwards, & Hughes, 2007;Popkin & Skinner, 2003;Sharp & Skinner, 2004;Theodore, Bray, & Kehle, 2004;Theodore, Bray, Kehle, & DioGuardi, 2003;Theodore, Bray, Kehle, & Jenson, 2001). They are appealing to teachers because they do not necessitate much teacher time (Elliot, Turco, & Gresham, 1987), are applied to the entire classroom (classroom-wide intervention), are easy to employ, and incorporate the use of peer influence and attention (Litow & Pumroy, 1975;Skinner, Cashwell, & Dunn, 1996).…”