The purpose of this study was to determine the relationship each of the mathematics web-based programs, MyMathLab and Assessments and Learning in Knowledge Spaces (ALEKS), has with students' mathematics achievement. In addition, the study examined the relationship between students' affective domain and the type of program as well as student achievement. The affective domain measures were students' anxiety, self-efficacy as well as their attitudes towards mathematics. The study used a quasi-experimental nonrandomized pretest-posttest control group during the spring 2016 semester. The data were collected using several different instruments including: (a) a questionnaire, (b) a test of prerequisite skills, and (c) an end-of-semester comprehensive final examination. (Abstract shortened by ProQuest.). [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.]