Problem systems in stochastics teaching. Didactic concepts of developing material and teacher in-service training in the LEDIS project. : Aufgabensysteme im Stochastikunterricht. Didaktische Konzepte zur Materialentwicklung und Lehrerfortbildung im LEDIS-

The project LEDIS aims at developing stochastics as example of application-oriented school mathematics. Parallel activities on a theoretical model level and with real random phenomena are intended for developing applications hand in hand with theory in the sense of contributing to mutual explanation but not of applying a previously developed mathematical theory on examples. For being able to put this guiding thesis into practice in projects with teachers, the didactic concept of a (mathematical) problem system for building up the back-up text has been developed in the project. This report presents some of the results of the project, which involves the task of developing and testing models for the in-service-training of teachers.