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Abstract: The author has presented 20 workshops teaching high school and college teachers to use GeoGebra. The formats have included one, two, and four hour workshops at professional meetings, all day in service sessions at high schools, and week long on line workshops through the MAA PREP program. One indication of the successfulness of the workshops is that a significant number of participants in the workshops have subsequently made presentations of their own at professional meetings. This paper explores working principles that should inform preparation of training material and gives an outline of material that is already available and what still remains to be developed.
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