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First off, calibrated questions avoid verbs or words like “can,” “is,” “are,” “do,” or “does.” These are closed-ended questions that can be answered with a simple “yes” or a “no.” Instead, they start with a list of words people know as reporter’s questions: “who,” “what,” “when,” “where,” “why,” and “how.” Those words inspire your counterpart to think and then speak expansively.
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Chris Voss (Never Split the Difference: Negotiating as if Your Life Depended on It)