| 2009 -- 2015 | 数学教育学会 | 国際部長（理事） |
| 2004 -- 2008 | 日本科学教育学会 | 理事 |
| 2011 -- 2013 | | 第6回東アジア数学教育国際会議, 顧問 |
| 2008 -- 2010 | | 6th EUROPEAN SUMMER UNIVERSITY ON THE HISTORY AND EPISTEMOLOGY IN MATHEMATICS EDUCATION, a Member of International Scientific Program Committee |
| 2007 -- 2009 | 日本教材備品協会 | 理事 |
| 2007 -- 2008 | | 11th International Congress on Mathematical Education, Member, Survey Team 6 of the Plenary Session |
| 2003 -- 2004 | | 10th International Congress on Mathematical Education, Chair, Topic Study Group 2 |
| 2001 -- 2003 | International Conference in Teaching Mathematics | 国際委員 |
| 2009-06 -- (現在) | | Official Advisor of Teacher Education, SEP, Mexico |
| 2009-05 -- 2014-04 | | Advisor of Teacher Education Project, Thailand |
| さらに表示... |