JoAnne - as a frequent switcher between NT ranges (including within one partnership), and also between transfers/no transfers, I disagree strongly that you can tell, based on the hand and the CC, whether this was mechanical or mind-forget. You can tell what the correct bid should have been, but not what the player intended to call.
I play, with one partner:
1NT-2S to show spades NV
1NT-2H to show spades V, or in 4th seat
(1D)-1NT-2S to show spades (at either vul)
1C-1NT; 2C-2H to show spades (again, any time)
We have yet to mind-forget (except the third one, but that happens all the time, either way, with many players (cuebid Stayman vs Systems on)), but it will happen. And if it truly was a mind-forget, I will eat it with the same equanimity I have when I prove the squeeze and play the wrong card because I was thinking "heart's now useless" rather than "spades are good" and out comes the heart instead of the spade(*). If it was mechanical, I will try to be allowed to change it; if the TD decides that it's not clear that it was a mechanical error, and disallows the Law 25A change, so be it. It won't be the first, last, or worst time the TD's judgement was Wrong but Wreasonable.
I do find that by and large, players are honest about answering the question "was that the bid you were going for?" I also find that by and large, the players who aren't are known to the local directors (and some of my fellow local directors are common sights at NABCs, so the information is being spread there as well), and they have more trouble convincing me than the rest.
A similar issue comes up in less complicated system pairs with P-1M; 2D with 4-card M support (so, was it "tried to pull 2C and missed" or was it "forgot we don't play 2-way Reverse Drury"?) and 1C-1H; 1NT-2D (so, mispull for 2C or did the player forget that this is the one partnership he plays Checkback Stayman and not New Minor Forcing?)
Oh, and as for bid boxes that are prone to odd calls - I made three red-and-green doubles this weekend when static stuck the first double to the last pass. I found it as amusing as when I redoubled partner's Alertable call out of turn.
(*) Ooh, missing footnote. When I took my motorcycle safety course, they said, repeatedly, "think space". Partly meaning "where is your escape *now*?" should be always going through your mind, but also 'if you see a rock or a pothole in the road, and you think "rock" or "hole", you'll steer towards it automatically. If you "think space", you'll steer towards that instead'. Similarly in bridge as above.
This post has been edited by mycroft: 2010-September-21, 16:22
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)