This mixed methods study examined the factors influencing students' decisions to choose traditional high school courses over the College in the High School (CiHS) option. The study involved a school personnel survey and interviews with students from diverse high school settings in the state of Washington to provide a comprehensive understanding of the decision-making process. Results indicated that course workload and student interest are the primary factors influencing students to choose traditional high school courses over CiHS options. Students expressed concerns about the perceived heavier workload associated with CiHS courses and the desire to pursue subjects aligned with their interests and career aspirations. Interestingly, there was a notable discrepancy between school personnel and students regarding the influence of peers on course selection. While school personnel believed peer influence to be significant, students reported little influence from their peers in their course decisions. This finding underscores the importance of considering student perspectives. Furthermore, the study highlights the critical role of school advising and counselors in supporting students' course choices. In the research, school personnel, particularly counselors, are identified as key figures in providing guidance and information to students about course options. Their expertise and support were instrumental in helping students navigate the decision-making process and make informed choices aligned with their academic goals and interests. Overall, this study shed light on the complex interplay of factors that influence students' course selection decisions and underscores the need for comprehensive support systems in high schools to facilitate informed decision-making and academic success. [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.]