This study utilized the longitudinal survey research design using students' motives to communicate with their instructors as a test case. Participants were 282 undergraduate students enrolled in introductory communication courses at a large Mid-Atlantic university who completed the Student Communication Motives scale at three points (Time 1: second week, Time 2: eighth week, Time 3: 14th week) during the Spring semester. The use of the longitudinal survey research design revealed three motives fluctuated in use: (a) the "relational" motive was used more at Time 3 than at Time 2, (b) the "functional motive" was used less between both Time 1 and Time 3 and Time 2 and Time 3, and (c) the sycophancy motive was used less between Time 1 and Time 2, but more between Time 2 and Time 3. The advantages of using a longitudinal survey research design in instructional communication studies are reviewed.