This study explored students' time use and focused on the relationship between student employment and other activities. It considered time use from two competing ideas of zero-sum and resource expansion. A zero-sum perspective assumes an inherent trade-off between time spent working and available time for other activities. A resource expansion model suggests that an activity such as student employment may not reduce time use in all other areas and may create opportunities to participate in more activities under certain conditions. This study used the Student Experience in the Research University (SERU) survey data with an analytic sample of 83,784 participants at 18 universities. Average time use and participation in a host of activities were calculated and then compared. The analyses explored differences between working and nonworking students across time intervals for both on- and off-campus employment; they also compared students who did not work with those who worked different amounts of time per week. Ordinary least squares (OLS) multiple linear regression and logistic regression were used to examine these relationships. The results of this study demonstrate significant relationships between work and most other uses of time. Although working students devote less time than their nonworking peers in some activities (e.g., studying, media consumption), they reported spending more time in other activities (e.g., partying, community service). Results also suggest that on-campus employment and fewer hours worked had fewer adverse relationships with other activities such as participating in student clubs. An implication of this study is the importance of staff and faculty to consider the role work plays in students' schedules. [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.]