Entry 15 PieFlow: A Visual Aid for Identifying Flows of Students between College Majors
Seokyeol Kim, Youngju Oh, Taeho Kim, and Jinah Park — Korea Advanced Institute of Science and Technology

Our visualization method aims to provide an intuitive view of student flows from the initial plan to the final decision for a college major. To illustrate the flows between the majors and the proportions of each major’s population at a glance, we combined the key features of classical pie charts and chord diagrams. Our work fundamentally consists of three concentric layers, and the meaning of each layer varies depending on whether the goal of visualization is to show the inflow or the outflow of students.

In case of the inflow, the innermost circle indicates the unique color of a major declared at the sophomore academic year (T3). Once an observer chooses the target T3 major, the proportions of majors selected at the freshman (T2) are shown in the middle ring-shaped layer, and majors intended at the high school (T1) are appeared on the outermost layer. For the better understanding of main streams, the order of majors in each layer is decided according to the scales of student flows.

Between the middle and outermost layers, paths that indicate the student flows from T1 to T2 are drawn by using B-splines. Since the color gradient of each path denotes the color of a major which is placed on the opposite end of the path, the observer can easily recognize that where students come from and where they move to. If the observer wants to focus on a specific student group instead of the whole students, he can set a filtering condition such as genders, college types, and ACT Composite Scores.

As for the outflow, the basic structure is same with the inflow situation except that the innermost circle indicates the target T1 major and the outermost layer contains the T3 majors.

Seokyeol Kim*, Youngju Oh*, Taeho Kim, and Jinah Park

School of Computing,
Korea Advanced Institute of Science and Technology, 
291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea
{sy.kim, pizzing, kdhtheo, jinahpark}@kaist.ac.kr