People have long judged leaders by what they achieve in their first 100 days, but that's far too generous, Eric McNulty writes. The best bosses aim to make a real difference within 10 days, making three decisions that are accompanied by action steps and board backing. "A 10-day plan is not a substitute for a full and thoughtful transition into a big new role, but it can be an essential element of one," McNulty writes.

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