“…The first is anchored in a formal relationship in which, for example, the role incumbents exercise co-or joint authority. A good example of the dynamics of shared role space is co-principals in schools (Court, 2003;Gronn & Hamilton, 2004). The second may be either a formally or informally grounded relationship across hierarchical levels as in the case of school principals or their deputies (Nias, 1987), managers and their immediate subordinates (Krantz, 1989), between organizational heads and campus or branch heads (Gronn, 1999), or between adjacent role incumbents, such as chairpersons and chief executives (Chityayat, 1985;Stewart, 1991a,b).…”