1. Amershi, S., Conati, C., Maclaren, H.: Using feature selection and unsupervised clustering to identify affective expressions in educational games. In: Proceedings of the Workshop. Motivational and Affective Issues in ITS. In: conjunction with ITS, 8th International Conference on Intelligent Tutoring Systems (2006), Jhongli, Taiwan (2006)
2. Baker, R.S.J.d., Corbett, A.T., Koedinger, K.R., Evenson, E., Roll, I., Wagner, A.Z., Naim, M., Raspat, J., Baker, D.J., Beck, J. Adapting to When Students Game an Intelligent Tutoring System. In: Proceedings of the 8th International Conference on Intelligent Tutoring Systems, pp. 392–401 (2006)
3. Baker, R.S., Corbett, A.T., Koedinger, K.R., Wagner, A.Z.: Off-Task Behavior in the Cognitive Tutor Classroom: When Students Game the System. In: Proceedings of ACM CHI: Computer-Human Interaction, pp. 383–390 (2004)
4. Chaffar, S., Frasson, C.: Using and Emotional Intelligent Agent to Improve the Learner’s Performance. In: Proceedings of the Workshop on Social and Emotional Intelligence in Learning Environments. In conjuction with Intelligent Tutoring Systems, Maceio, Brazil (2004)
5. Cohen, J.A.: Coefficient of Agreement for Nominal Scales. Educational and Psychological Measurement 20, 37–46 (1960)