Improving student performance in America's chronically underperforming schools has been a challenge for many decades. Despite various school reforms, little to no progress has been shown. Schools have continued to fail, and achievement gaps have widened. The current state of schools has called for a drastic intervention. School turnaround has emerged as the country's response to improving persistently-low performing schools. This study was designed to determine if the turnaround models outlined in the federal school improvement grant (SIG) were effective in improving student performance in low-performing schools in Florida. Specifically, this study investigated the impact of the transformation and turnaround intervention models on student achievement. This study also sought to determine if size (school enrollment), socioeconomic status (FRL), minority enrollment rates (Black and Hispanic), as well as principal gender, race, and years of experience moderate the relationship between the intervention model used and student achievement. The ultimate objective was to determine if turnaround intervention models improved student performance in low-performing schools in Florida. A quantitative method, including three statistical analyses, was employed to respond to three research questions and test nine corresponding null hypotheses. Florida's 69 SIG Cohort I schools were identified for data collection and analysis. A t test analysis revealed there was not a significant difference in the performance of the transformation and turnaround model schools as measured by percent of points earned towards school grade. Further, chi square analysis revealed there was not a relationship between the model (transformation or turnaround) and school grade. Additionally, multiple regression analysis revealed none of the moderator variables were statistically significant. A discussion of the findings, implications for policy and practice, and recommendations for turnaround are explained in detailed, followed by suggestions for future research. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]