Saint-milion Grand Cru wines are produced under slightly tighter production restrictions than regular Saint-milion wines. As with other grand cru appellations, the intention behind this is to improve the quality, and to distinguish the area’s finer wines from the more everyday wines.However the designation is distinct from that of Saint-milion Grand Cru Class; confusingly for the non-expert, the top-tier wines from Saint-milion are not marked out by their grand cru status, but by their appearance in the Saint-milion Wine Classification, which confers grand cru class (64 Chteaux in 2012) and premier grand cru class status (14 classs “B” and, at the very top, 4 classs “A”). This works in a similar way to the classifications of the Mdoc, Graves and Sauternes, but with one significant difference: it is periodically reviewed to keep it up-to-date and relevant. It was first drawn up in 1955, and (after a controversial review in 2006) was most recently updated in 2012.