“…The vast majority of group contingency research in schools has focused on the evaluation of the IGC. Researchers have demonstrated the effectiveness of the IGC to increase behaviours such as class participation (Cheatham et al, 2017), on-task behaviour (Denune et al, 2015;Leflot et al, 2013;Pennington & McComas, 2017), academic engagement (Caldarella et al, 2015;Christ & Christ, 2006;Clair et al, 2018;Collins et al, 2017;Hernan et al, 2019;Popkin & Skinner, 2003), social and supportive interactions (Groves & Austin, 2017;Kohler et al, 1990;Popkin & Skinner, 2003), homework completion and accuracy (Little et al, 2010;Reinhardt et al, 2009), and physical activity (Foote et al, 2017;Galbraith & Normand, 2017;Kuhl et al, 2015;Normand & Burji, 2020). Researchers have also demonstrated the effectiveness of the IGC to decrease behaviours such as inappropriate behaviour (Barrish et al, 1969;Donaldson et al, 2011;McGoey et al, 2010), off-task behaviour (Clair et al, 2018), disruptive behaviour (Beeks & Graves, 2016;Caldarella et al, 2015;Christ & Christ, 2006, Clair et al, 2018Foley et al, 2019;Groves & Austin, 2017), transition time between classes (Campbell & Skinner, 2004;Hawkins et al, 2015), and cell phone use during class (Hernan et al, 2019;Jones et al, 2019).…”