Abstract: The use of computers to help teaching overcomes a fast development. One of the main objectives is to teach isolated people who can't join regular university courses. We show in this paper that computers can be used to efficiently teach in a classroom without the need of modern and expenseive equipement for students. The paper is divided in two parts: in the first part we expose the principles, results and evaluation of two experiments performed in parallel during the teaching of a one-term fourth year undergrad course. In the second part we expose how those two techniques can be extended in a single more general technique, by using XML to define and manipulate a general purpose database of solved problems; and how such a database can be built in a dynamic and collective way. For the first experiment, the students of the course had to fill a marked quiz every week. Each week, 61 distinct quizzes were randomly generated from an SGML database of multiple choice questions on the material covered in the 3 last courses. Each student received a distinct personal quiz. This dimish the likely hood of rewarding answers that are copied from one's neighbour. Using various techniques, those 61 quizzes of 4 questions each were marked by a single person in less than one hour, including the time needed to report the marks. For th
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