“…A dominant framework for understanding how social norms form, change, and operate is the social identity approach (Reicher, Spears & Haslam, 2010;Spears, 2021), developed in social identity theory (Tajfel & Turner, 1979) and self-categorization theory (Turner et al, 1987;see Hornsey, 2008, for a review). The social identity approach proposes that belonging to social groups provides individuals with a definition of the group (i.e., a social identity), and a description and prescription of what is involved in being a group member (i.e., the group's norms).…”