1. Anderson, J.R., Corbett, A. & Lewis, M.W. (1990). Cognitive Modelling and Intelligent Tutoring. Artificial Intelligence, 42, 7–49.
2. Arruarte, A. & Fernández, I. (1995). A two-phased development shell for Learning Environments. A design proposal. Tinsley & van Weert (Eds.), World Conference Computer in Education VI (pp. 53–65). Chapman & Hall.
3. Arruarte, A., Fernández, I. & Greer, J. (1996a). The CLAI Model. A Cognitive Theory to Guide ITS Development. Journal of Artificial Intelligence in Education, 7 (3/4), 277–313.
4. Arruarte, A., Elorriaga, J.A. & Fernández-Castro, I. (1996b). Knowledge Reusability: some Experiences in Intelligent Tutoring Systems. Proceedings of the Workshop Architectures and Methods for Designing Cost-Effective and Reusable ITSs. Montreal.
5. Arruarte, A., Fernández, I., Ferrero, B., & Greer, J. (1997a). The IRIS Shell: “How to Build ITSs from Pedagogical and Design Requisites”. International Journal of Artificial Intelligence in Education
8 (3/4), 341–381.