“…Current research on teacher noticing has generally centred on supporting teachers, both pre-service and inservice, to engage in professional inquiry focusing on children's mathematical understanding. These studies have used diverse contexts such as video clubs (Coles, 2013;van Es, 2011;Walkoe, 2015), lesson study (Lee & Choy, 2017;Weiland & Amador, 2015), artefacts (Fernández, Llinares, & Valls, 2012;Sánchez-Matamoros, Fernández, & Llinares, 2015;Son, 2013), narratives (Ivars & Fernández, 2018), and one-to-one interviews (McDonough, Clarke, & Clarke, 2002). A common important assumption underlies them all is that growth in teachers' noticing expertise can be inferred from their professional discourse.…”