“…While role mastery has a long history in HRM research (Feldman, 1981), it has, to our knowledge, seldom been examined in the context of volunteering. This is surprising, given that the two dimensions of role mastery (i.e., role clarity and self-efficacy) arguably play a more salient role in volunteering than in paid employment due to the pervasiveness and persistence of role ambiguity and low confidence and efficacy beliefs among volunteers (Haski-Leventhal & Bargal, 2008;Kramer, 2011;Kramer et al, 2013). In the present study, we show that role mastery promotes volunteers' commitment to the organisation.…”