Ms. Wong, a third grade teacher, wants to address a disruptive student's behavior through action research. She plans to use a single-subject A-B-A-B design to study the effects of time-out on the student's disruptions. First, she will establish a baseline by observing the student's behavior for several days. Then she will introduce time-out periods for a few days to see if it decreases disruptions. She will repeat the cycle, ideally finding that time-out reduces the problematic behavior so it is no longer needed. The main challenge will be observing the student during time-out while still teaching other students.