On-line support of off-line exercises in mathematics is described. In the offline exercises, a student fees quiz-papers selected by him/herself according to his/her own learning history. Every student in a class may have different quiz-papas. The teacher has to edit ail the quiz-papers beforehand, and prepare necessary number of papas Br each quiz in an exercise. A teaching assistant and a communication system are essential to actually operate such individual learning opportunities for the students. The on-line support function is implemented fbr the purpose into the World Wide Web (WWW)-based learning environment developed by the authors. A WWW server collaborating with a database manager saves the necessary information fbr the students, the teacher, and the teaching assistant through their own pages displayed on their WWW browsers. The student in the course knows the result of his/her exercises just ater the evaluation, and reserves new quiz-papas Br the coming exercises. The teacher sets the schedule of off-line exercises and inputs the marks, and the teaching assistant knows the necessary number of papers for an each quiz br preparing them before hand. One of the authors has used it in his algebra course during the whole 1998/99 school year, and has confirmed the validity of the function.
