Automatic Adaption of Exercise Problems to the Proficiency Level of the Learner

Online exercise systems should be able to automatically adapt the level of difficulty of the problems to the level of proficiency of the learner. In our Communication and Tutoring Sys-tem CATS we have implemented a measurement algorithm that keeps track of the perform-ance level of a learner by measuring the percentage of correct answers at the current level, the reliability with which the learner answers the questions and the time he/she takes. From these measures we derive a unified performance parameter that controls the presentation of the next set of questions. These are then generated dynamically by the exercise applet