QUOTE(petrat @ Feb 24 2006, 07:15 PM)

You will need a quick way to make notes on each performer as you listen. It is almost essential to have a copy of the piece being played or sung in front of you too. I always mark on the following points and give each section a mark out of 20. Add the totals and you get the winner.
1 Accuracy of performance.
2 Stage presence.
3 Quality and suitability of choice.
4 Technique and musicallity.
An enjoyable performance may not be an accurate one. and so not a winning one. In a competition I look for a competent rendition of a piece within the player's ability. I do not give extra credit for a competitor who attempts a too difficult piece and makes a "reasonably go of it". I prefer to hear and see a pollished performance without slips. Good luck with it all. I am sure that it will be fun.
I've been invited not to judge of course

to concerto competitions and yes, the above, was pretty much what they were looking for -
accuracy,
presence,
suitability of choice,
technique and
musicality.
Surprisingly, I found that judges are
highly critical of wrong choice - choosing/playing a hard piece reasonably as opposed to playing an easy piece very well. This criticism didn't seem fair since I wouldn't think of a nervous kid as a show-off. Rather, it is the teacher's choice more than a pupil's, surely? And, if the pupil had chosen wrongly, then it'd have been the teacher's responsibility to veto it?