The European Interferometry Initiative (Eii) is an open association of Institutes and Laboratories willing to collaborate on the exploitation and development of long baseline interferometry in optical/infrared astronomy. The Eii confederates the activities included in the European Commission instruments of the 6th, 7th and H2020 R&D program.

The current Eii activities are:
  • The establishment of a network of VLTI expertise centres across Europe,
  • A joint research activity preparing for a third generation of VLTI instruments,
  • The Fizeau staff exchange programme,
  • The organisation of VLTI training summer schools.

Most of the funding for the activities was obtained through OPTICON - the Optical Infrared Co-ordination Network for astronomy, via WP8 and WP11 (2017-2020, grant agreement 730890), WP14 (2013-2016, grant agreement 312430)  and WP11.2 (2009-2012, grant agreement 226604).