James Murdoch's public appearances before committees investigating the News Corp. hacking scandal have become an embarrassment for all concerned, writes Margaret Heffernan. To avoid meeting a similar fate, bosses should be careful not to appear overconfident or over-reliant on B-school jargon during their public appearances. "Murdoch Jr. isn't the first executive called upon to convey greater authority than he naturally has," Heffernan writes. "Everyone has to do this at some point in their career -- so it's worth taking note of where he goes wrong."

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