This document is a final report on data from the external evaluation of The Leadership Collaborative (TLC). The TLC was a project during 2008-2012 by the Association of Public and Land-grant Universities (APLU) and 25 member universities and colleges. Institutions pursued advances in their education of prospective middle and high school teachers in the subjects of science or mathematics. The project was funded by a National Science Foundation grant from NSF's Mathematics-Science Partnership program, Research, Evaluation and Technical Assistance projects (MSP-RETA): "Promoting Institutional Change to Strengthen Science Teacher Preparation", grant #0831950.