“…Without changes in norms of behavior, including more open, trusting relationships among school staff, schools are likely to remain characterized by professional isolation and a strong control orientation (Cusick, 1992;Keedy & Achilles, 1997). Research indicates that school principals play a key, if indirect role, in promoting higher student achievement (Hallinger & Heck, 1998;Marzano, Waters, & McNulty, 2005;Witziers, Bosker, & Kruger, 2003).…”