Cooperation between the cantons occurs at the cantonal, regional, or Swiss-wide level, depending on the educational level and the respective task. Cantons can cooperate on various issues and coordinate their efforts. Tasks where uniform solutions are called for Swiss-wide (e.g. school structures, educational objectives and recognition of educational qualifications) are regulated at the national level by the Swiss Conference of Cantonal Ministers of Education (EDK), which comprises the 26 cantonal ministers responsible for education, culture and sport. The EDK performs tasks which the cantons and regions cannot perform alone. Tasks which call for regional cooperation (e.g. linguistic regions' curricula) are handled by the EDK's regional conferences. In general, the cantons' cooperation is regulated within legally binding intercantonal agreements (or concordats).