... Several of the studies [23,44,47,52,54] cited the 1989 United Nations Convention on the Rights of the Child or associated legislation (e.g., Children Act 1989, the main source of child welfare law for England and Wales) to justify the necessity of investigating children's perspectives. Common theoretical frameworks used by study authors across time to frame their study or findings were theories of attachment [40,41,43,48,49,63], child development [41,45,46,49,50,58,63], child well-being [40,41,45,46,49,50,52,56] and identity development [23,40,47,52,54,56,61,63,64]. Another influential discourse was the "best interests of the child" which was referenced by eight studies [23, 46-48, 50, 56, 60, 62], two from a critical perspective [23,60]. ...