2012 Blue Flags: Greek Beaches and Marinas Rank Second in the World

http://greece.greekreporter.com/2012/05/23/2012-blue-flags-greek-beaches-and-marinas-rank-second-in-the-world/

Get on that ferry!  And come on in, the water's lovely..............

These are the beaches listed
Evros (2), Rodopi (4), Xanthi (1), Kavala (16), Thessaloniki (11), Chalkidiki (35), Pieria (10), Larissa (6), Magnesia (15), Fthiotida (8), Evia (2), Viotia (2), Attica (12), Korinthia (11), Argolida (2), Arcadia (1), Lakonia (7), Messinia (5), Elia (7), Achaia (4), Etoloakarnania (2), Corfu (35), Lefkada (7), Kefalonia (11), Chania (25), Rethymno (18), Heraklion (14), Lasithion (40), Rhodes (32), Kos (5), Santorini (3), Ios (3), Sifnos (2), Paros (4), Naxos (3), Myconos (1), Andros (3), Kea (1), Chios (1), Lesbos (7),  Limnos (3), MARINAS: Chalkidiki (2), Attica (2), Korintia (1), Lefkada (1), Corfu (1), Lasithi (1), Kos (1).

I'm wondering what the criteria for listing are, and if there are beautiful beaches on small islands too small to be considered.