When you're done memorizing this entire glossary, it's time to take the grueling written and blind tasting exam to become a Master of Wine. In truth, it is the wine trade's most famous and most demanding professional qualification. It's quite the prestigious designation; only 200 or so people in the world have qualified as Masters of Wine and only 16 of them reside in the United States. The weeklong exam is administered via the Institute of Master of Wine in London. Wine professionals who have earned the designation often add the MW credential after their name.