When to Overrule?

[Steve M]

Duk,
Sam's right, don't ever overrule or correct without having called time & talked things over with your partner. When I work with a "young ump", I won't say or do anything when there's just bad judgement - we'll be sure to cover that in our post-game. If there's a rules problem, I'll ask if my partner wants some help - they know from our pre-game that what this question is really saying is "we've got a problem that we need to talk about and fix now."