“…Research on test-based accountability and principals' work has consistently found that principals play a central role by redirecting time, materials, personnel, and professional development toward improving student achievement on high-stakes assessments (Anagnostopoulos & Rutledge, 2007;Booher-Jennings, 2006;Diamond & Spillane, 2004;Firestone, Monfils et al, 2004;Ladd & Zelli, 2002;Lemons, Luschei, & Siskin, 2003;Malen, Croninger, Muncey, & Redmond-Jones, 2002;Mintrop, 2004). Researchers have found that principals narrow curricular and instructional expectations, redirect instructional time to high-stakes subjects such as reading and mathematics, and increase before-and-after-school activities geared toward improving students' academic achievement (Anagnostopoulos & Rutledge, 2007;Booher-Jennings, 2006;Ladd & Zelli, 2002).…”