The purpose of this study was to investigate the effects on reading achievement for middle school students after participation in a computer-based reading intervention program, READ 180, as well as the relationship of program participation to later dropout rates, compared to students enrolled in a traditional reading remediation program. A nonequivalent control group research design was used to examine data collected from 384 students in Grades 6 through 8 participating in reading interventions spanning a 3-year period from 2003 through 2006. Independent samples t test and chi-square statistics were used to analyze data to determine the yearly reading achievement mean gains, differences between the effects of the two reading interventions, and later dropout frequencies. There were no significant differences between the treatment and comparison groups in reading scores during the first year of READ 180 implementation. Computer software problems affected the implementation of READ 180 during the first semester of implementation. The findings reveal a statistically significant difference between the effects on reading achievement scores for students who participated in READ 180 when implemented with moderate fidelity compared to students in a traditional reading remediation program during the 2nd and 3rd years of implementation. The findings in this study revealed that an intensive reading intervention, READ 180, can significantly improve reading achievement for struggling adolescent readers when implemented with moderate fidelity. Analyses of the data revealed differences between the number of 2003-2004 reading intervention participants and the school division cohort dropout rates. A significant difference was not observed between the 2004-2006 cohort dropout rates when compared to the school division rates. The findings in this study will be beneficial to secondary principals who are held accountable for literacy development, implementation, and evaluation as the school instructional leader. / Ph. D.