The Rule of Three
Get your counterpart to agree to the same thing three times in one conversation to distinguish real commitment from counterfeit 'Yes.'
The Rule of Three is a verification technique that gets your counterpart to agree to the same thing three times within a single conversation. It exists because there are three types of 'Yes' (Commitment, Confirmation, and Counterfeit), and most people are very good at giving a Counterfeit 'Yes' once but find it extremely difficult to fake conviction three times.
The technique works by varying the approach for each of the three agreements. The first might be a direct agreement. The second could be a summary that triggers 'That's right.' The third might be a calibrated 'How' question about implementation. By using different approaches, you avoid sounding like a broken record while thoroughly testing the sincerity of the agreement.
The Rule of Three also incorporates the 7-38-55 percent rule (Mehrabian's research): only 7% of communication comes from words, 38% from tone of voice, and 55% from body language. Each of the three agreement points gives you another opportunity to check for incongruence between words and nonverbal signals.
- It is extremely hard to repeatedly lie or fake conviction
- Three types of 'Yes' exist: Commitment, Confirmation, and Counterfeit
- Vary your approach for each of the three agreements to avoid sounding repetitive
- Watch for incongruence between words and body language at each checkpoint
- When someone says 'I'll try,' it means 'I plan to fail'
- When someone says 'You're right,' they are not vested in the outcome
- Get the First AgreementAchieve initial agreement through normal negotiation. This might be a direct 'Yes' to your proposal or a verbal commitment to specific terms.Pro tipPay attention to tone and body language during this first agreement. Note any hesitation, shifts in posture, or changes in vocal pitch.
- Confirm with a Summary for 'That's Right'Summarize what was agreed upon using labels and paraphrasing. The goal is to get your counterpart to say 'That's right,' which confirms genuine understanding and buy-in, not just surface agreement.Pro tipA summary that triggers 'That's right' is far more reliable than a simple 'Yes.' If you get 'You're right' instead, the commitment may be counterfeit.
- Test with a Calibrated Implementation QuestionAsk a 'How' or 'What' question about implementation: 'What do we do if we get off track?' or 'How will we know we're on track?' This forces your counterpart to articulate the details of execution, which is much harder to fake.WarningIf your counterpart says 'I'll try' in response to implementation questions, recognize this as a red flag. It almost always means they have no intention of following through.
- Watch for the 7-38-55 IncongruenceAt each checkpoint, observe whether words, tone, and body language are aligned. If someone says 'Yes' but their tone drops or they break eye contact, label the incongruence: 'I heard you say yes, but it seemed like there was hesitation in your voice.'Pro tipLabeling incongruence shows respect and builds trust. Your counterpart will appreciate your attentiveness rather than being offended.
Inmates agreed to surrender one at a time, calling back on walkie-talkies to confirm they were not harmed. The plan was agreed upon, but a SWAT team member who was not fully on board confiscated the walkie-talkie from the first surrendering inmate, nearly causing the remaining inmates to start killing hostages.
Voss developed this technique through years of hostage negotiations where agreements frequently fell apart during implementation. The prison siege in St. Martin Parish, Louisiana, was a defining case: negotiators designed an elaborate surrender ritual, but a SWAT team member confiscated a walkie-talkie that was essential to the plan, nearly causing the inmates to execute a hostage. The lesson was clear: getting to 'Yes' means nothing if implementation fails. The Rule of Three was designed to test commitment and catch implementation problems before they become crises.