“…Second, one important characteristic of promises is that they are normatively binding (i.e., they entail an obligation that one should keep one's word), and research has shown that young children already comprehend the normativity of some social rules and will hold responsible others who do not abide to norms (Schmidt & Tomasello, 2012). For example, 3-year-olds will actively correct a puppet actor that fails to play a game correctly (Rakoczy, Warneken, & Tomasello, 2008) or will intervene if a puppet tries to take someone else's property (Rossano, Rakoczy, & Tomasello, 2011), often using norm-related language during their interventions (e.g., ''You did that wrong," ''You must not do this").…”