I am/was:

• [Nov 2024] Committee supervisor for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Nov 2023] Committee supervisor for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Mar 2023] A member of assessor team for InaM²C (Indonesia Mathematical Modeling Challenge) for middle and high schools.

• [Nov 2022] A member of assessor team for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Nov 2021] A member of assessor team for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Mar 2021] A co-organiser and a member of assessor team for InaM²C (Indonesia Mathematical Modeling Challenge) for middle and high schools.

• [Nov 2020] A member of assessor team for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Feb 2018] Question setter for mathematics in Ijen Mathematics and Science Competition (IMCS) for grade IV and V students, Banyuwangi, Indonesia.

• [Aug 2017] Question setter and a member of assessor team for SanmarFest, a regional mathematics competition for middle schools, organised by Santa Maria Catholic High School, Surabaya, Indonesia.

• [Sep 2015] Question setter for SanmarFest, a regional mathematics competition for middle schools, organised by Santa Maria Catholic High School, Surabaya, Indonesia.

• [Aug 2014] Question setter and a member of assessor team for SanmarFest, a regional mathematics competition for middle schools, organised by Santa Maria Catholic High School, Surabaya, Indonesia.

• [Nov 2013] A member of assessor team for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Sep 2013] Question setter for SanmarFest, a regional mathematics competition for middle schools, organised by Santa Maria Catholic High School, Surabaya, Indonesia.

• [Nov 2012] Head of question setter team and a member of assessor team for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Nov 2011] A member of question setter team for Parahyangan Catholic University Mathematics Competition (KOMAT) for middle and high schools, Bandung, Indonesia.

• [Nov 2010] A member of question setter team for Parahyangan Catholic University Mathematics Competition (KOMAT) for elementary schools, middle and high schools, Bandung, Indonesia.