The Learning Style of Students and Utilization of CAS in Exploration-based Learning Tadashi Takahashi Department of Intelligence and Informatics Konan University 8-9-1 Okamoto, Higashinada, Kobe Hyogo 658-8501, JAPAN Phone: (Japan)+78-435-2533 E-mail: takahasi@konan-u.ac.jp The utilization of CAS can support an exploration-based learning style. Up to now, CAS has been used in mathematics education mainly as a device for explanation. And rather than serving as a neutral tool, it has often been imposed on students by the teacher. The use of CAS is also limited by the learning content, and because teachers have a strong influence over the interpretation of teaching materials, in order to make the learning content intuitively understandable, CAS significantly limits the activities and knowledge of students. In order to overcome this problem, CAS must be used in a precise way, in accordance with the aims of learning activities. If this is not possible then CAS use will be merely enjoyable, but the learning content will be unclear, and students will not be able to appreciate the value of using CAS. CAS is in essence a tool to support exploratory thinking. Accordingly, since it was developed, CAS has been a tool of experts. In order to utilize it as a tool for mathematics education, CAS must be employed not as a device for explanation, but as a tool for the support of thinking―otherwise it is not being used in an essential way. People turn over ideas in their minds and put them to the test, finally building several ideas. Using CAS as a tool to support this thinking process is the real way to utilize it as an effective tool for learning mathematics. By analyzing the learning styles of students and the use of CAS in exploration-based learning, we can shed light on the relationship between them.