The Agreement on Cooperation in Astrophysics, which was signed by eight European countries in La Palma on the 26th May 1979, confers on signatory organisations effective participation in the decision-making process by means of an International Scientific Committee (CCI).
There are three levels to the agreement:
Entry into the ENO can be secured by subscribing to the International Agreement and Protocol and signing a (Third Level) Agreement; specifying the instrument to be installed.
Under the terms of this agreement, Spain provides the site in return for a package that includes at least 20% of observing time.
A further 5% of observing time at each telescope will be used for the 5% International Time Programme (ITP), which is available to member organisations and to all Spanish institutions with permission from the IAC.