Änderungen

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* [[EMS]]  European Mathematical Society) Member of  the Committee of Education of ESM (1988-1992);     
 
* [[EMS]]  European Mathematical Society) Member of  the Committee of Education of ESM (1988-1992);     
 
* [[GDM]]  German Society for Mathematics Education) Scientific Advisory Board (1988-1994);     
 
* [[GDM]]  German Society for Mathematics Education) Scientific Advisory Board (1988-1994);     
 +
{{gdmbeirat|1986|1989}}
 
* [[GTZ]]  German Society for Technological Collaboration:  Expert-Consultant and Evaluator of an Indonesian Mathematics and Science Project 1990     
 
* [[GTZ]]  German Society for Technological Collaboration:  Expert-Consultant and Evaluator of an Indonesian Mathematics and Science Project 1990     
 
* [[ICMI]]  International Commission of Mathematics Instruction) regular Topic-Group and Discussion-Group organizer on congresses of ICMI, Member of IPC of ICME 11 in Mexico 2008     
 
* [[ICMI]]  International Commission of Mathematics Instruction) regular Topic-Group and Discussion-Group organizer on congresses of ICMI, Member of IPC of ICME 11 in Mexico 2008