In 2005, the California Department of Education (CDE) contracted with the American Institutes for Research (AIR) to examine the implementation, impact, costs, and benefits of the HPSGP. The CDE identified four primary evaluation questions for the study (1) How effectively did participating schools and districts implement the HPSGP? (2) What has been the overall impact of participation in the HPSGP on school and district personnel, parents, and the community, and on school and district organization, policies, and practices? (3) What has been the impact from a school’s participation in HPSGP on student performance? (4) What unintended consequences have resulted from the implementation of the HPSGP? This final report summarizes evaluation activities completed during this two-year study and presents findings for these research questions drawn from a mixed-methods approach.