Southeast Asia Regional Consultation on People's Participation in Environmentally Sustainable Development (1990 : Puncak, Indonesia) (Puncak Pass, West Java, Indonesia)
International Symposium Sustaining Food Security and Managing Natural Resources in Southeast Asia--Challenges for the 21st Century (2002 : Chiang Mai University, Thailand)
International Workshop Participatory Technology Development and Local Knowledge for Sustainable Land Use in Southeast Asia (2001 : Chiang Mai, Thailand)