Environmental Education is one of the cross-curricular themes, introduced in the mid 1990s in the curriculum of Flemish secondary education (12-18 yr). Both the Brundtland report and the ENSI philosophy inspired the development of the objectives for EE. A strong partnership exists between the departments of education and the environment of the Flemish Ministry and the provincial authorities, which resulted in the project "MOS", an environmental management system for primary and secondary schools. Besides environmental objectives, the pedagogical objectives of the project are strongly emphasised. The UN Decade of Education for Sustainable Development provides a strong stimulus to link Environmental Education to the other cross-curricular themes, Citizenship and Health Education and to include the "MOS"-project into the broader framework of Education for Sustainable Development. (Contains 1 table and 4 endnotes.)