Services in Japanese High Schools . Why and How Are They Used? Tadashi OkadaɹGraduate School of Science and Engineering, Ibaraki Uni-versity Jun IioɹDept. of Socio-informatics, Faculty of Letters, Chuo Uni-versity Yoshihiko KubotaɹFaculty of Education, Utsunomiya University Tatsuhiro YonekuraɹCollege of Engineering, Ibaraki University 1