Absence of Conflict of Interest

The PCER Consortium (2008) study summarized in this intervention report had numerous contributors, including staff of Mathematica Policy Research, Inc. (MPR). Because the principal investigator for the WWC early childhood education review is also an MPR staff member, the study was rated by staff members from Chesapeake Research Associates, who also reviewed the intervention report. The report was then reviewed by MPR staff and external peer reviewers.