Next: Virtual Observatory Interoperability . ... AstroGrid, a UK e-Science astro-informatics project, with collaborating groups drawn from the major UK data archive centres, is creating the UK's first virtual observatory. ... AstroGrid is one of three major funded world-wide projects (along with the European Astrophysical Virtual Observatory (AVO, Quinn 2002) and US National Virtual Observatory (NVO, Hanisch 2002) which are aiming to create an astronomical Virtual Observatory. ... Astronomy: Models) . ...