Reviewing literature is essentially an act of interpretation. That is, the reviewers elect which literature to include and which to exclude based upon the guiding questions for the review. Those decisions shape the conclusions from the review. In this review we have not reported the findings of the many reports that describe work within PLCs nor have we reported the results of reflective self-reports of the value of this work. In part, this is because we accept as valid and significant the perspectives of teachers and administrators that this work is valued and perceived positively (Bambino, 2002; Carver, 2004; Olson, 1998; Slick, 2002).