“…As such, it has been emphasized in many policy documents across the world (Australian Education Ministers, 2006;National Mathematics Advisory Panel, 2008;Singapore Ministry of Education, 2006;Woodward et al, 2012). Perhaps as a result, in the domain of algebraic problem-solving, studies have focused on measuring strategy flexibility (Newton et al, 2019;Star & Seifert, 2006;Xu et al, 2017), understanding important factors that could affect strategy flexibility (DeCaro, 2016;Jiang et al, 2021;Keleş & Yazgan, 2021;Ramirez et al, 2016;Shaw et al, 2020;Threlfall, 2009;Wang et al, 2019), and how instructional interventions could facilitate strategy flexibility (De Smedt et al, 2010;Nistal et al, 2014;Star & Rittle-Johnson, 2008;Star et al, 2015a, b).…”