Student Modelling in a Web-based Algebra Tutor

1 Maria Virvou, University of Piraeus, Department of Informatics, 80 Karaoli & Dimitriou St., Piraeus 18534, Greece, [email protected] 2 Victoria Tsiriga, University of Piraeus, Department of Informatics, 80 Karaoli & Dimitriou St., Piraeus 18534, Greece, [email protected] Abstract This paper describes the student modelling component of Web-EasyMath, an adaptive Web-based Intelligent Tutoring System that is aimed at teaching the domain of algebraic powers. The system constracts a short and a long term student model based on a combination of stereotypes and the overlay technique. The long term model is updated based on a data ageing mechanism, leading to a student model that reflects the current knowledge state of the student.