“…A total of 23 articles discussed flexible ability grouping as a strategy to reduce excellence gaps. Fourteen of those studies used quantitative methodologies (Adelson & Carpenter, 2011; Assouline et al, 2013; Barber & Wasson, 2015; Becker et al, 2014; Brulles, Peters, & Saunders, 2012; Catsambis & Buttaro, 2012; Decristan et al, 2017; Dougherty et al, 2017; Garrett & Hong, 2016; Preckel & Brüll, 2010; Redding & Grissom, 2021; Steenbergen-Hu et al, 2016; Valiandes, 2015; Vogl & Preckel, 2014), 8 used qualitative approaches (Benny & Blonder, 2018; Faber et al, 2022; Galanti, 2021; Meyer et al, 2020; Missett et al, 2014; Mullett et al, 2018; Park & Datnow, 2017; Rubenstein et al, 2015), and 1 used mixed methods (Murphy et al, 2017). Sixteen of the studies focused on learning contexts in the United States, and 7 studies examined learning contexts in other countries, including 4 in Germany (Becker et al, 2014; Decristan et al, 2017; Preckel & Brüll, 2010; Vogl & Preckel, 2014), 1 in Cyprus (Valiandes, 2015), and 1 systematic review that evaluated studies in nine different countries (Faber et al, 2022).…”