Some coworkers hold back from telling you information you need. Withholding is a form of sulking in disguise. These colleagues usually know more than you do about a given subject and are hurt that you have not acknowledged their expertise. Consequently, to make you come to them, they tell you none or only part of what you have to know.

They will not cooperate until you verbalize your recognition and appreciation of their knowledge. Their buttoning up is a frustrating tactic, but it sure gets your

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