This paper describes the concept and implementation of a collaborative learning platform for school education over the Internet. The authors called this platform the "eTrip System," because they applied it to a school field study. Using information technologies, it supports the whole learning flow for a field trip: pre-trip learning; hands-on learning; and post-trip learning. It enables students to learn more effectively and more vigorously by providing them with a collaborative environment based on a student-extended database and electronic bulletin board. The system was evaluated experimentally for a field trip by senior high school students. (Contains 13 references.) (Author/MES)