Never Split the Difference: Negotiating as if Your Life Depended on It

by Chris Voss

THE 7-38-55 PERCENT RULE In two famous studies on what makes us like or dislike somebody,1 UCLA psychology professor Albert Mehrabian created the 7-38-55 rule. That is, only 7 percent of a message is based on the words while 38 percent comes from the tone of voice and 55 percent from the speaker’s body language and face. While these figures mainly relate to situations where we are forming an attitude about somebody, the rule nonetheless offers a useful ratio for negotiators. You see, body language and tone of voice—not words—are our most powerful assessment tools. That’s why I’ll often fly great distances to meet someone face-to-face, even when I can say much of what needs to be said over the phone. So how do you use this rule? First, pay very close attention to tone and body language to make sure they match up with the literal meaning of the words. If they don’t align, it’s quite possible that the speaker is lying or at least unconvinced. When someone’s tone of voice or body language does not align with the meaning of the words they say, use labels to discover the source of the incongruence. Here’s an example: You: “So we’re agreed?” Them: “Yes . . .” You: “I heard you say, ‘Yes,’ but it seemed like there was hesitation in your voice.” Them: “Oh, it’s nothing really.” You: “No, this is important, let’s make sure we get this right.” Them: “Thanks, I appreciate it.” This is the way to make sure your agreement gets implemented with no surprises. And your counterpart will be ...