“…Researchers have continued to more specifically characterize the knowledge that teachers and teacher educators must acquire and apply (Almasi, 2002;Ball, 2000;Joshi et al, 2009;Shulman, 1986Shulman, , 1987, craft professional development programs that help teachers cultivate such knowledge (McCutchen et al, 2002;Spear-Swerling & Brucker, 2003), and develop instruments that provide reliable and valid estimates of teacher knowledge (Ball, Phelps, Rowan, & Schilling 2003;Moats, 1994;Cunningham, Perry, Stanovich, & Stanovich, 2004;Moats & Foorman, 2003;Phelps & Schilling, 2004). This theoretical work is based on the premise that it is entirely possible to examine the disciplinary knowledge base of teachers, ascertain how this knowledge base is associated with student outcomes, and then develop empirically validated ''best practices'' in literacy instruction based on the knowledge of teachers that is most predictive of student gains.…”