I found this quote on the Star Alliance website, it comes from a message that ADP and Star are teaming up in the development of CDG Terminal 1:
In parallel, since April 2004, Aéroports de Paris has been refurbishing Terminal 1 of Paris CDG to reach a level of quality comparable to terminals E and F of Terminal 2 (level B of IATA standards).
Can anyone tell me what "Level B of IATA standards" means? What other levels are there? What are the criteria? Which airports are in which category? Is there a site to look that info up?