>In Greece:
	Hellenic Ministry for the Environment, Physical Planning and Public Works
	General Secretariat of Public Works
	Attiko Metro S.A.
	Technical Chamber of Greece
	Hellenic Association of Consulting Firms
	Hellenic Association of Environmental Protection Companies
	Hellenic Construction Economics Institute
	Hellenic Standards Organization (ELOT)
>Abroad:
	European Union
	European Federation of Engineering Consultancy Associations
	International Federation of Consulting Engineers
	American Society of Civil Engineers (ASCE)
	American Consulting Engineers Council (ACEC)