The purpose of this study was to evaluate the effectiveness of School Improvement Grants (SIGs) in the state of California (CA) in increasing student achievement using the turnaround implementation model. The American Recovery and Reinvestment Act of 2009 (ARRA) included educational priorities focused on fixing America's lowest achieving schools. SIGs (i.e., up to $2 million per school annually over 3 years) to the nation's persistently lowest achieving public schools required schools accepting these awards to implement a federally prescribed school-reform model. Of these models, the school turnaround model is the most aggressive and least used. Using data from CA, the researcher analyzed student achievement results in reading and mathematics at six high schools in CA over a three-year span between their pre- and post-SIG-award year. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]