A.DE.T.T.E.'s activities and proposals are supported by the Ministry of Tourist Development. The association collaborates with the Organization of Tourist Education and Training (The Educational Body of the Ministry Of Tourist Development),  the Hellenic Federation of Hotel Directors, the Attica Union of Hospitality Managers, the Cretan Hotel Directors Association, the Beach Hotels Union and the Hellenic Barmen Association. The Municipal Enterprise of Tourist Development of Sifnos is an official member of the union as well.

Α.DE.Τ.Τ.Ε. collaborates individually with several tourist institutions and Municipalities, while it maintains excellent relations with the tourist press.