“…The developmental intergroup approach (e.g., Abrams & Rutland, 2011;Rutland, Killen & Abrams, 2010) has been applied to understand developmental variation in attitudes across contexts of social exclusion (e.g., Abrams et al, 2003), aggression (e.g., Nesdale & Duffy, 2012) and prosocial behaviour (e.g., Sierksma, Thijs, Verkuyten & Komter, 2014). To date, no study to our knowledge has employed this approach to specifically examine developmental differences in rates of prosocial bystander intentions from childhood into adolescence.…”