“…The contributors promote students' development of forms of sophisticated mathematical reasoning, which are more than procedural expertise. Some contributors fostered students' domain-specific reasoning (Best & Bikner-Ahsbahs, 2017;Frieman, Polotskaia, & Savard, 2017;Johnson, McClintock, & Hornbein, 2017;Savard & Poloskaia, 2017;Strømskag, 2017), while other contributors fostered students' domain-transcendent reasoning (Chan & Clarke, 2017;Graven & Coles, 2017;Kuntze, Aizikovitsh-Udi, & Clarke, 2017;Lithner, 2017;Lozano, 2017). By domain specific reasoning, we mean reasoning related to mathematical content (e.g., number, algebra, geometry).…”