Utility maximization is widely used to model individuals’ activity scheduling and rescheduling behavior. Utility maximization is based on the assumption that the modeled behavior is the result of a reasoned decision. An alternative to a planned behavior is habitual behavior, whose execution process has become automatic due to its repeated performance. Compared to activity scheduling, little is known about the activity rescheduling behavior. In this paper, we focus our attention on the rescheduling behavior. We step back and ask a basic question: is the activity rescheduling behavior reasoned or habitual? Our initial expectation is that rescheduling behavior is mostly habitual behavior due to its feature of repeated performance. We answer this question by conducting an experiment. Results from the experiment confirm our original null hypothesis that rescheduling behavior is mostly a habitual behavior.