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Experimental and Active Learning with Computer Algebra Systems: Results and Concepts of Two Austrian Projects: the DERIVE Project and the TI-92 Project: Helmut Heugl, Austria.

``Before the background of didactical concepts like the White Box/Black Box Principle, I will give some examples according to our most important result: using CAS will lead to a more pupil-centred and experimental learning process. At last I will shortly represent the concept and the goals of our new TI-92 project. More than 100 pupils from the 7th to the 12th grade are involved.''