“…Interdependent group contingencies have proven effective in increasing scores on spelling, math, and English assignments (Popkin & Skinner, 2003), increasing the number of items learned (e.g., identifying the states that comprise the Northwest Region) in social studies (Dugan, Kamps, Leonard, Watkins, Rheinberger, & Stackhaus, 1995), increasing the use of components related to creative writing (Maloney & Hopkins, 1973), increasing the number of correct Spanish word translations (Lloyd, Eberhardt, & Drake, 1996), increasing reading performance (Alric et al, 2007;Sharp & Skinner, 2004), and improving homework accuracy (Reinhardt, Theodore. Bray, & Kehle, 2009).…”