The ESOs are: CEN (The European Committee for Standardisation), CENELEC (The European Committee for Electrotechnical Standardisation) and ETSI (The European Telecommunications Standards Institute).
Standardiorganiteks on CEN (Euroopa Standardikomitee), CENELEC (Euroopa Elektrotehnika Standardikomitee) ja ETSI (Euroopa Telekommunikatsioonistandardite Instituut).