Designed to offer a "common language" to all of the parties involved in European cooperation in education, the European Education Metathesaurus is the set made up of the European Education Thesaurus (the third edition of the EUDISED Thesaurus) and the indexing languages that will be attached to it, whether sub-thesauri, specialized vocabularies, co-thesauri, or national vocabularies. It is designed to change along with its core, the European Education Thesaurus, as it changes both to keep up with developments in education and to accommodate additional indexing languages. Current developments are the result of efforts to provide a technically consistent answer to the problems posed by its huge, changing, transdisciplinary nature while overcoming the obstacles of multilingualism and internationality. The first two chapters of this paper comprise a definition of the basic concepts, a brief description of the EUDISED Thesaurus, and a detailed presentation of the form of technical description to be used later in the paper. The remaining chapters describe the other kinds of indexing language that will be linked to the European Education Thesaurus to build the Metathesaurus set. Technical questions are given prominence with a view to providing concrete preparatory methods for the future management of the various indexing languages and their reciprocal relations, and questions relating to other conditions needed for achieving this project are also dealt with. Seven annexes include additional information on the EUDISED Thesaurus, a list of CEDEFOP (European Center for the Development of Vocational Training) Thesaurus top terms, abbreviations, a glossary, and an 11-item bibliography. (DB)