THE ARTICLE · 9 MIN
Never Split the Difference is a negotiation book by a former FBI hostage negotiator, and it is full of techniques with names. Here are its big ideas in our own words, what research says about each technique, and a few small practices drawn from the parts that hold up.
About the book
Never Split the Difference: Negotiating As If Your Life Depended On It is by Chris Voss, written with Tahl Raz. Harper Business published it in May 2016; the library catalogue record gives viii, 274 pages. The publisher’s description says Voss worked as a hostage negotiator, “Reaching the pinnacle of his profession, he became the FBI’s lead international kidnapping negotiator.”
It is a practical guide for a general reader. Each chapter teaches one principle through a story, often from a hostage or kidnapping case (the book’s stories include a kidnapping in Haiti and one in the Philippines), and then applies it to everyday deals; the catalogue description lists “buying a car, negotiating a salary, buying a home, renegotiating rent”. Outside the book, NBC News reported in 2009 that Voss had been the FBI’s lead international kidnapping negotiator from 2003 to 2007 and retired in 2007 after 24 years in the FBI.
The book is in copyright, so we did not read it in full. We read the library catalogue record, the publisher’s description, short passages through the Open Library search-inside tool, and the studies listed below.
The big ideas
1. People negotiate with feelings first
The book opens at Harvard, where Robert Mnookin, director of the Harvard Negotiation Research Project, asked Voss over “just to chat” and drew him into an impromptu negotiation; Voss answered each move with some version of “How am I supposed to do that?”. He then contrasts his approach with Getting to Yes, which he calls “a groundbreaking treatise on negotiation” built on the idea that the two sides could reason their way to a mutually beneficial deal. In his experience, “Getting to Yes didn’t work with kidnappers”. His claim is that a negotiation is mostly about the other side’s emotions and fears, and only then about logic.
2. Tactical empathy
His central tool he calls tactical empathy: “Tactical empathy is understanding the feelings and mindset of another”, and using that understanding to influence what happens next. He describes it as “listening as a martial art”.
3. Mirror, then label
Two listening moves do most of the work. A mirror, “for the FBI”, is repeating “the last three words (or the critical one to three words)” of what someone just said, which invites them to say more. A label names the feeling you hear. In the book’s words, “Labeling is a way of validating someone’s emotion by acknowledging it.”
4. Look for “no”, not “yes”
Voss warns that pushing for “yes” tends to get you a “counterfeit ‘yes’”, while saying “No” makes the speaker “feel safe, secure, and in control”. “‘No’ is the start of the negotiation, not the end of it,” he writes.
5. Ask “how” and “what”
Instead of arguing, he asks open questions that begin with “How” or “What”, which he calls calibrated questions. He says they “make your counterpart feel like they’re in charge”, and he ranks “How am I supposed to do that?”, the question from the Harvard scene, among the “greatest-of-all-time calibrated questions”.
6. Bend their reality, then bargain hard
On money, the book’s advice is to let the other side go first “most of the time”, but when you do name numbers, to “set an extreme anchor to make your ‘real’ offer seem reasonable”. For haggling it offers the Ackerman model, named after Mike Ackerman, whom the book describes as “an ex-CIA type who founded a kidnap-for-ransom consulting company”: set a target, open at 65 percent of it, then raise in decreasing steps to 85, 95 and 100 percent, use “precise, nonround numbers” at the end, and on the final number “throw in a nonmonetary item”.
7. Find the black swans
The last chapter is about unknown unknowns; the publisher’s page sums it up as “Revealing the Unknown Unknowns”. In the book, Black Swans are “events or pieces of knowledge that sit outside” what we expect, and Voss calls them “leverage multipliers”. His advice is to dig for them by listening, and, where possible, by getting face time with the other side.
What holds up
The book’s listening tools come from FBI crisis negotiation training, which is well documented. The FBI’s own model, the Behavioral Change Stairway Model, was “developed by the FBI’s Crisis Negotiation Unit”, and a 2005 review co-written by a member of that unit lists mirroring and emotional labelling among the core skills. The studies that review reports are role-play training studies (expert negotiators used more active-listening skills than non-experts, and training increased them); it reports no controlled study of real incidents. Beyond that, the research is a mix: anchoring holds up, the listening tools have indirect support, and two of the book’s specific claims do not hold up as stated. The rows above give each claim, our verdict and the source.
Moving first or second: a genuine disagreement
The case for moving first. In three experiments published in 2001, “whichever party, the buyer or seller, made the 1st offer obtained a better outcome”, and later work found the effect “remarkably robust across cultures and multi-issue negotiations”. The same 2001 paper found the advantage disappeared when the side receiving the offer thought about the first mover’s alternatives or limit, or about its own target.
The case for moving second. The book’s advice is to let the other side go first “most of the time”. One argument for it is that the other side’s number tells you something. A 2017 study tested that with written scenarios and a classroom negotiation exercise: when one side had full background information and the other had none, it was better for both sides, the informed one included, not to make the first offer. A 2021 paper names the gap between practitioners’ advice to move second and researchers’ advice to move first the “Practitioner-Researcher paradox”.
Where it leans. Information explains much of the gap. According to the 2017 paper, the existing research deals almost solely with cases where both sides have a clear reference for the market price, “and suggests it is best to move first in such a situation”. Where one side knew far more than the other, its studies favoured waiting, for the informed side too. That rests on one paper, mostly using written scenarios, so it is a lead rather than a settled rule. The book’s “most of the time” is stronger than the evidence supports.
How to use it
These practices come only from the parts that hold up. They describe what people do; what fits your situation is your call.
- Labelling tentatively. FBI training treats a label as a guess offered aloud (“You seem frustrated”), noting that even a wrong guess shows you are trying to understand.
- Mirroring lightly. The mimicry studies suggest that subtle mirroring can help and obvious mirroring hurts. In practice that can mean an occasional mirror rather than one after every sentence.
- Opening with a number when both sides know the market. Ambitious first offers tend to anchor deals, but very ambitious ones raise the risk of no deal. People who are unsure of the market let the other side speak first and learn from their number.
- Giving a real option to refuse. The nearest research to the “no” idea is on telling people they are free to say no, which raised compliance in most contexts, according to a meta-analysis of 42 studies.
- Reading a mismatch, not a percentage. Mehrabian’s work was about inconsistent messages of feelings and attitudes. When someone says “fine” in a flat voice, the tone is worth a follow-up question; the 7 percent figure is not a rule for ordinary talk.
Who it’s for, and who can skip it
It suits readers who negotiate often, or who dread it, and want concrete phrases to try: the stories are vivid and the listening tools are easy to practise. Readers who want evidence for each technique will find the book stronger on stories than on studies; the research above is the place to look for that. People who already know Getting to Yes or crisis-negotiation training will recognise much of the listening material, here told through case stories.
If you liked this
- How to Win Friends and Influence People, summarised: an older book on listening and seeing the other side, checked against later research.
- Cognitive biases, checked, including anchoring, the bias behind the first-offer advice.
- Thinking, Fast and Slow, summarised, Daniel Kahneman’s book on the two systems Voss borrows to explain why emotion comes first.
Sources
- C. Voss with T. Raz, Never Split the Difference: Negotiating As If Your Life Depended On It (Harper Business, 2016): catalogue record and short passages via the Open Library search-inside tool; publisher’s page.
- E. Angulo, “How do you negotiate with a pirate? Be patient”, NBC News (14 April 2009).
- G. M. Vecchi, V. B. Van Hasselt and S. J. Romano, “Crisis (hostage) negotiation: current strategies and issues in high-risk conflict resolution”, Aggression and Violent Behavior 10 (2005).
- M. D. Lieberman et al., “Putting feelings into words”, Psychological Science 18 (2007); J. B. Torre and M. D. Lieberman, “Putting feelings into words: affect labeling as implicit emotion regulation”, Emotion Review (2018); Y. Ariely et al., “Affect labeling and reappraisal as an emotion regulation strategy”, Affective Science 7 (2026); S. G. Shamay-Tsoory and E. Levy-Gigi, “You name it: interpersonal affect labeling diminishes distress in romantic couples”, Behavior Therapy 52 (2021).
- W. Kulesza et al., “Mimicry and law”, PLOS ONE (2023); R. Hale and A. F. de C. Hamilton, “Testing the relationship between mimicry, trust and rapport in virtual reality conversations”, Scientific Reports 6 (2016); M. H. Wessler, D. D. Loschelder, J. C. Fendel and M. Friese, “The too-much-mimicry effect”, Journal of Nonverbal Behavior (2023); W. D. Trzmielewska and T. Rak, “Confederate motor behavior in control conditions and liking effects of being mimicked”, Journal of Nonverbal Behavior (2026).
- A. Mehrabian, “Silent Messages”, author’s website (Internet Archive copy); A. Mehrabian and M. Wiener, “Decoding of inconsistent communications”, Journal of Personality and Social Psychology 6 (1967); A. Mehrabian and S. R. Ferris, “Inference of attitudes from nonverbal communication in two channels”, Journal of Consulting Psychology 31 (1967).
- C. J. Carpenter, “A meta-analysis of the effectiveness of the ‘but you are free’ compliance-gaining technique”, Communication Studies 64 (2013).
- A. D. Galinsky and T. Mussweiler, “First offers as anchors”, Journal of Personality and Social Psychology 81 (2001); B. C. Gunia et al., “The remarkable robustness of the first-offer effect”, Personality and Social Psychology Bulletin 39 (2013).
- Y. Maaravi and A. Levy, “When your anchor sinks your boat”, Judgment and Decision Making 12 (2017); Y. Maaravi and B. Heller, “Buyers, maybe moving second is not that bad after all”, Frontiers in Psychology 12 (2021).
- M. Schweinsberg, H. M. Petrowsky, B. Funk and D. D. Loschelder, “Understanding the first-offer conundrum”, PNAS 120 (2023); “The influential first offer”, Current Opinion in Psychology (2026); D. D. Loschelder, M. Friese, M. Schaerer and A. D. Galinsky, “The too-much-precision effect”, Psychological Science 27 (2016).
- L. M. Van Swol, M. T. Braun and D. Malhotra, “Evidence for the Pinocchio effect”, Discourse Processes (2012); B. M. DePaulo et al., “Cues to deception”, Psychological Bulletin 129 (2003); V. Hauch et al., “Are computers effective lie detectors?”, Personality and Social Psychology Review (2015).
Checked October 2026. What we read: the catalogue record, the publisher’s description and short search-inside passages of the 2016 Harper Business edition (not the whole book), the NBC News report, and the studies above (abstracts, plus the full texts of the 2005 FBI review, the 2023 law-office study, the 2017 information-asymmetry study and the 2015 meta-analysis of language cues to lying).
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