“…While there is agreement that coaches must be seen as credible to be effective (Joo, 2005;Judge & Cowell, 1997;Passmore & Fillery-Travis, 2011;Segers et al, 2011;Sue-Chan & Latham, 2004), there is debate around how this credibility can be established. This debate has been between those who believe that coaches do not need skills or expertise in the management or organisation sector in which they work but rather need skills in counselling psychology or therapy (Ajzen, 1992;Beutler, Machado, & Neufeldt, 1994;Lafferty, Beutler, & Crago, 1989;Petty & Cacioppo, 1984), and those who argue that coaches must have skills or expertise in either executive management development and/or in the sector in which they are practising (Berglas, 2002;Eggers & Clark, 2000;Evers et al, 2006;Hagen, 2010;Joo, 2005;Passmore & Fillery-Travis, 2011;Smither et al, 2003;VanFleet, 1999). The evidence available in the 111 studies reviewed here tends towards the latter conclusion, that skills or expertise in the sector or in executive management are preferable (De Haan, 2008a;Judge & Cowell, 1997;Kiel et al, 1996;Orenstein, 2006;Smith Glasgow et al, 2009;Wasylyshyn, 2003).…”