1. Kashihara, A., Hasegawa, S.: A model of meta-learning for web-based navigational learning. Int. J. Adv. Technol. Learn. 2(4), 198–206 (2005)
2. Land, S.M.: Cognitive requirements for learning open-ended learning environments. Educ. Technol. Res. Dev. 48(3), 61–78 (2000)
3. Ministry of Education, Culture, Sports, Science and Technology (MEXT),“ the Period for Integrated Studies” (in Japanese)
4. Lecture Notes in Computer Science;A Kashihara,2013
5. Matsubara, Y.: Simulation Virtual reality system, Knowledge base, The Institute of Electronics, Information and Communication Engineers, group S3 part 11 “Education support system”. In: Education/Learning Support System, Chap. 4, pp. 17−22 (2011). http://www.ieice-hbkb.org/files/S3/S3gun_11hen_04.pdf