vuroth, on Oct 16 2008, 09:24 AM, said:
How standard is it? I looked at BWS (for example), but couldn't really tell.
It's not standard. It's part of what's called "Italian style cuebidding" and seems to be gaining increasing acceptance in the expert world though. The prime alternative is sometimes called "American style cuebidding" where you cuebid first round controls up the line and then show second round controls only later.
The Italian style seems superior, primarily because most people play a version of blackwood (or keycard, or turbo) which allows you to sort out whether you are off an ace. Thus the main goal of cuebidding is to avoid a suit with two quick losers so as to be sure that if you are off only one ace you still have a shot to make your slam. It can also be important to locate a source of tricks (i.e. knowing whether partner has the king in your AQJxx suit is huge).
It's worth mentioning that there are some additional cuebidding variants within this style. For example:
(1) Many will not immediately cuebid shortness in a suit which partner has bid naturally because this may cause partner to mis-evaluate certain strong holdings (i.e. KQJxx is great opposite a cuebid of the ace, not so wonderful opposite a cuebid of void, and basically garbage opposite a cuebid of singleton).
(2) Some require that a cuebid of a suit they have already bid naturally show two of the top three honors. The same folks will sometimes cuebid a queen in a suit partner has bid naturally.
(3) Some agree that the last available cuebid below the game level is "last train" and does not show a control in the suit named. Instead it shows control in any suit where partner has denied control (i.e. slam suitability).

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