“…We have identified the kind of relationships -high quality and high trust relationships, leaders must form with followers to effectively exercise influence (Graen & Uhl-Bien, 1998;Lapidot, Kark, & Shamir, 2007). We have also developed a more sophisticated understanding of how situational variables shape effective leader behavior (Vroom & Jago, 2007) -with variables operating at the dyadic (Mumford, Dansereau, & Yammarino, 2000), group (Day, Gronn, & Salas, 2006), organizational (Tushman & O'Rielly, 1996), and cultural (Dickson, Resick, & Hanges, 2006) levels having been identified. Moreover, we have begun to develop models, models of transformational and charismatic leadership, that seem to account for leadership beyond expectation (Bass & Avolio, 1990;Conger & Kanungo, 1998;Mumford, 2006).…”