The purpose of this interpretative phenomenological analysis study was to explore how undergraduate student government participants at a state university in California engage in decision-making in their official roles. This study focused on an auxiliary student government organization called Associated Students located at one of the twenty-three campuses in the California State University System. The perceptions and experiences of five student participants in this organization were explored. The findings produced four superordinate themes. The first theme, "Student Representation," revealed the participants' purpose of their role and how it impacted their approach to decision-making. The second theme, "Experience in Role," contributed to the participants' perceived ability and understanding of the decision-making process. The third theme, "Approach to Decision-Making," provided context about how the participants' own perspectives and various influences on their perspectives affected their decision-making. The final theme, "Importance of Reflection," explained how the participants made sense of their role as a decision-maker through increased awareness of their actions and thoughts in the decision-making process. This study affirms the need for intentional training for student government participants to learn about their role responsibilities, specific expectations of their role and the authority they have within their role. Additionally, pertinent information sharing should begin early in the student's role and presented multiple times in preparation to make an informed decision. This study also discovered that the importance of guided reflection should be part of a student government participant's responsibilities. Guided reflection serves as an accountability measure for the student and an outlet to think more intentionally about their role, and the decisions they make as a student government participant. [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.]