The purpose of this study was to identify significant differences in academic achievement among virtual students of various backgrounds, demographics, and virtual learning environments. The study also sought to identify factors that may predict the academic achievement, as defined by final course grade, of virtual students. This study examined those relationships for the 476 students enrolled in virtual courses between January 2010 and January 2013 in Sullivan County Schools, TN. These students were in grades 7-12 during the time the courses were taken. Independent variables in Phase I of the study included gender, race/ethnicity, socio-economic status, prior number of virtual courses completed, and existing student grade point average. Independent variables in Phase II of the study included instructional dialogue in the virtual course, structure of the virtual course, and autonomy of the learner allowed in the virtual course. The researcher investigated the relationships between these independent variables and the dependent variable, academic achievement, as determined by final virtual course grade. The statistical methods used to answer the research questions included bivariate correlations, independent samples t-tests, and bivariate regression analysis. [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.]