In his book “Data Driven: Profiting from Your Most Important Business Asset,” Thomas Redman recounts the story of economist John Maynard Keynes, who, when asked what he does when new data is presented that does not support his earlier decision, responded: “I change my opinion. What do you do?”

“This is the way good decision makers behave,” Redman explained. “They know that a newly made decision is but the first step in its execution. They regularly and systematically evaluate how well a decision is proving itself in practice by acquiring new data. They are not afraid to modify their decisions, even admitting they are wrong and reversing course if the facts demand it.”

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