The purpose of this study was to investigate the effectiveness of the CompassLearning Odyssey® Math (Compass Math) program on increasing mathematics achievement scores for students in an urban environment over two consecutive years. Thousands of schools and districts across the country currently utilize the Compass Math program for their students despite a somewhat limited research base supporting its effectiveness in increasing student math achievement scores. This quantitative research study also investigated the relationship between the proficiency attainment of two broad measures of math achievement to determine if student "success" as defined by these assessments showed a high level of correspondence. This quasi-experimental research study utilized data from an archived data set regarding two urban charter schools that demonstrated similar academic performance for two years prior to the Compass Math program being implemented at one of the schools. Study participants included 162 students at the treatment school who participated in the Compass Math program and 119 students at the comparison school who participated in only the regular math instruction. Five research questions were addressed using a combination of one-way ANCOVA analyses, paired sample t-tests, and chi-square analyses. Results showed that students who received the Compass Math program outperformed comparison group students on the Northwest Evaluation Association (NWEA) Measures of Academic Progress (MAP) achievement growth measure at both year one and year two of the treatment. In addition, students in the treatment school did not show any growth in their MAP scores prior to the implementation of Compass Math but exhibited a large increase or growth in these scores during the implementation year. Results also showed that there was no relationship between students who reached proficiency on the Wisconsin Knowledge and Concepts Examination (WKCE) with those who reached proficiency on the NWEA MAP growth target at either the treatment or the comparison school. [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.]