Invited reporter for the workshop II 'Teaching and training' at Quality and efficiency of education and training: findings from study visits, organized by CEDEFOP, 1-2 February 2010 in Thessaloniki.

Organizing team member of DG1 on Curriculum reforms: movements, processes and
policies, ICME 11, July 6-13 2008 Mexico, Monterrey.

Invited participant and speaker, Institute for Advanced Study's Park City Mathematics Institute (IAS/PCMI) in Park City, Utah, USA, 8-13 July 2007.

Invited Speaker - Matematik Eğitiminin Psikolojisi (Psychology of Mathematics Education). Matematik Etkinlikleri-2006, Matematikçiler Derneği.