The visible part of a sommelier's job lasts about ninety seconds per table. Nearly everything that determines whether the wine programme works happens hours or months earlier.
The list is a buying decision, not a menu
A wine list is assembled from what a venue could obtain, afford and store, which is narrower than what exists. Availability of small production wines is frequently the binding constraint.
Each bottle bought ties up cash until it is sold, so a list is also a statement about how much money the business is willing to leave sitting in a cellar.
That pressure shapes the shape of the list. Depth in one region usually means an owner backed a particular buyer's conviction rather than trying to cover everything thinly.
Service begins long before the doors open
Bottles have to be moved from storage to service temperature, which takes hours and cannot be improvised. Whites and sparkling need chilling capacity, and reds often need cooling rather than warming.
Stock is checked against what sold the previous evening, and anything opened for by-the-glass service is assessed for whether it still shows properly.
Decanting decisions are made in advance where a wine is known to need air. Deciding at the table is usually too late to help the bottle.
Reading a table is the actual skill
The useful question is rarely which grape someone likes. It is what the table is celebrating, what they are eating and roughly what they intend to spend without saying so.
Price is the most delicate part, and the established technique is to point at a bottle on the list rather than say a number aloud. It lets a guest agree or move without discussing money.
A good recommendation is one the table would have chosen themselves with more information. Steering people towards a house favourite they did not want is the fastest way to lose them.
The tasting ritual checks for fault, not preference
When a small measure is poured for the person who ordered, the question being asked is whether the wine is sound. It is not an invitation to reconsider the choice.
Cork taint, oxidation and volatile faults are the things being screened for, and all three are detectable in a few seconds by smell alone.
A faulty bottle is replaced without argument because the supplier usually credits it back. A bottle rejected because a guest simply dislikes the style sits in a much greyer area.
Margin management runs underneath all of it
Sommeliers are judged on what the wine programme contributes, which means moving stock that has been sitting rather than only selling what is easy.
Wines that have aged past their window in the cellar represent money already spent, so quietly finding homes for them is part of the work.
The best floor teams treat the list as inventory with a shelf life rather than a trophy cabinet. That framing explains most of what they recommend.