The purpose of this study was to evaluate the effect of the Norton High School Early College Early College Program on academic measures for students at Norton High School. Measures of achievement include the results of the English Language Arts (ELA), Mathematics, Social Science, and Science portions of the California Standards Test (CST), Student Opportunity to Learn (OTL), high school attendance rates, high school grade-point averages, and college matriculation. A retrospective quasi-experimental design was used to analyze the difference in CST scores (English Language Arts, Mathematics, Science, and Social Science); OTL, attendance rates, grade-point averages, and college matriculation rates between the retrospective control group (pre-intervention) and the intervention group (post-intervention). The results of this study indicate that the Norton High School Early College (NHSEC) program has a positive affect on most student achievement measures. The NHSEC positively impacts both success and proficiency on CST tests. CST success improved in ELA, AP/ADV Math, and Chemistry. CST proficiency improved in ELA, US History, AP/ADV Math, Biology, and Chemistry. The NHSEC program also positively impacts Opportunity To Learn (OTL). Students in the intervention group were more likely to enroll and persist in higher-level mathematics and science courses. A positive impact also was seen in attendance rates. Students in the intervention group had a higher mean attendance rate than the retrospective control group. The quantitative data in this study did not reveal higher grades and increased college matriculation for Norton High School students. However, several external factors may have affected these variables. The results of the NHSEC program effects on student achievement measures were promising. The positive outcomes on CST scores and OTL were consistent with the goals of NCLB and could assist Norton High School in meeting both AYP and API. According to the results of this study, the early college concept impacts Norton High School's student achievement measures positively. [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.]