1. Aleven, V., McLaren, B.M., Sewall, J., Koedinger, K.R. The Cognitive Tutor Authoring Tools (CTAT): Versatile and increasingly rapid creation of tutors. Accepted for presentation at the 8th international conference on intelligent tutoring systems, Jhongli, Taiwan, 26–30 June 2006.
2. Aleven, V., Sewall, J., McLaren, B.M., Koedinger, K.R. Rapid authoring of intelligent tutors for real-world and experimental use. Submitted to the 6th IEEE international conference on advanced learning technologies (ICALT 2006), Kerkrade, The Netherlands, 5–7 July 2006.
3. Alfonseca, E., Carro, R.M., Martin, E., Ortigosa, A., Paredes, P. The Impact of Learning Styles on Student Grouping for Collaborative Learning: A Case Study, in this issue (2006)
4. Anderson J.R., Corbett A.T., Koedinger K., Pelletier R. (1995) Cognitive tutors: lessons learned. J. Learning Sci. 4, 167–207
5. Aronson E., Blaney N., Stephan C., Sikes J., Snapp M. (1978) The Jigsaw Classroom. Sage Publishing Company. Beverly Hills, CA