The purpose of the current study was to determine the relationship, if any, regarding school districts' teachers' average years of service, number of years of implementation of the CSCOPE math curriculum, and student achievement on the STAAR (State of Texas Assessments of Academic Readiness) mathematics scores in Grades 5 and 8. The STAAR is the state-mandated assessment system used to comply with federal testing guidelines. One hundred and sixty-six districts were used in the study, student achievement data were collected on the following student subgroups: White, African-American, Hispanic, Limited English Proficiency, Economically Disadvantaged, Special Education and All Students. Data collected from the 2012-2013 school year were analyzed using multiple regression to determine which independent variable was a more accurate predictor of student scores. Results of the current study determined that among various student subgroups the districts' teachers' average years of teaching experience was a strong predictor of student achievement on the mathematics STAAR in Grades 5 and 8. [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.]