Don't let the pursuit of a great business plan get in the way of stellar execution, says former Thomson Reuters CEO Dick Harrington. A business plan can always be a little bit better, he argues, but the most important information usually comes from interacting with customers. "There is a point at which additional information or research will not change the basics of your strategy. When you get your strategy there, you have to 'Nike it' - you just do it," he says.

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