Think Again: The Power of Knowing What You Don't Know
Shows how doubting your own beliefs improves your judgment, and how to change other people's minds with questions and build teams that admit and fix their mistakes before they become disasters.

Table of Content
1. Introduction
57 sec
Most of us try to win arguments by sharpening our reasoning, then lose them anyway to a stubborn colleague or relative. In Think Again, Wharton organizational psychologist Adam Grant argues that we have been training the wrong skill: good judgment depends less on how well you think than on how willing you are to rethink. His evidence runs from a smartphone giant that lost almost its entire market to a Black musician who talked members of the Ku Klux Klan out of their racism.
Grant’s case is that doubt is a working tool, for your own mind and for the people around you. Hold beliefs as hypotheses, admit what you don’t know, and you make better decisions, persuade more people and build teams that catch their own mistakes. Along the way you’ll pick up a way to argue with fewer reasons and more questions, a test for your own blind spots, and a reason never to say that failure is not an option.
2. Treat your plans as theories worth testing
1 min 53 sec
BlackBerry once owned nearly half the smartphone market, then fell to almost nothing in five years. The cause was one belief that never got tested, and the fix comes from an unexpected profession.
3. Spot the blind spots hiding your weakest skills
1 min 29 sec
Some of the people least able to tell a joke rate themselves as the funniest in the room. The same trap hides in your own skills, and confidence alone will never reveal it.
4. Win more debates with fewer, stronger arguments
1 min 57 sec
A study of alumni donations found that adding a second reason to give cut the number of donors in half. Skilled negotiators understand why, and they argue in a very different way.
5. Ask questions that let people persuade themselves
1 min 55 sec
A mother in a Quebec hospital refused to vaccinate her premature baby. The doctor who changed her mind barely argued at all, and his method also works on habits from smoking to gambling.
6. Loosen prejudice by showing it was chance
1 min 46 sec
A Black musician persuaded Ku Klux Klan members to leave the Klan, and one later asked him to be his daughter’s godfather. His approach began with a single question about where beliefs come from.
7. Present hard issues with more than two sides
1 min 54 sec
A famous climate documentary moved governments, yet years later many people were still unconvinced. Grant points to a framing habit that pushes people into camps, and to a surprising way experts can earn more trust.
8. A team culture where mistakes get caught early
1 min 56 sec
A falling piece of foam doomed a space shuttle after a team decided it did not matter. The deeper failure lay in the culture, and the best teams in Silicon Valley show the alternative.
9. Conclusion
1 min 12 sec
Think Again rests on an unusual idea of strength. The person who refuses to budge looks strong, and BlackBerry’s inventor looked strong right up until his market vanished. Grant’s examples suggest that real strength lies in being able to say you might be wrong, and then checking.
His most personal advice concerns identity. If you define yourself by your opinions, every challenge to them feels like an attack, and you cling to them even after the evidence turns. Grant suggests anchoring yourself in your values instead, such as fairness, integrity or excellence. Those can stay with you for life, while your beliefs about how to serve them remain free to change.
That shift makes the other habits easier. Hold your plans as tests to run, keep your confidence for the goal and your doubts for the method, argue with your best reason and a good question, and leave the other person free to decide.
And the next time someone tells you they are 100 percent certain they are right and you are wrong, Grant offers a useful clue: they are probably the one who needs to think again.
About this book
What is this book about?
Most people believe they lose arguments, cling to bad plans or misjudge situations because they need to think harder. Adam Grant, an organizational psychologist at Wharton, argues that the missing skill is rethinking: the willingness to doubt what you believe and update it when the world changes. Grant builds his case from vivid examples. BlackBerry's collapse after the iPhone, studies showing that the least skilled people overrate themselves the most, and the loss of NASA's Columbia shuttle all show the cost of certainty. On the other side stand a doctor in Quebec who helped a reluctant mother decide to vaccinate her baby, a Black musician who persuaded Klan members to leave the Klan, and negotiators who win with fewer arguments and more questions. Readers get practical tools for three settings: their own judgment, conversations with people who disagree, and team cultures where mistakes can be admitted and fixed. Underneath runs one idea worth keeping: define yourself by your values, and let your beliefs change.
Book Information
Who it's for
Professionals hoping to persuade
Professionals who keep losing arguments and want a better way to change minds.
Managers wanting open debate
Managers and team leads who want people to admit mistakes and debate the work openly.
Decision makers questioning assumptions
Founders and decision makers who suspect their strategy rests on beliefs they have never tested.
About the Author
Adam Grant
Adam Grant is an American organizational psychologist who teaches at the University of Pennsylvania's Wharton School, where his research covers motivation, generosity, creativity and potential. He is a number one New York Times bestselling author whose books include Give and Take and Originals, and he hosts the WorkLife podcast. Grant earned his BA at Harvard and his PhD at the University of Michigan. He was once a junior Olympic springboard diver and a magician.
Ratings & Reviews
Ratings at a glance
What people think
Listeners consider this work essential for the modern era, valuing its abundance of practical insights and stimulating material that prompts a shift in perspective. The prose is captivating; while one listener describes the writing as having a conversational feel, another points to the inclusion of thoroughly researched anecdotes. Listeners value the hands-on guidance based on concrete recommendations, noting how it supports self-improvement and the adoption of a growth mindset.
Top reviews
Adam Grant has a way of making complex psychology feel like a chat over coffee. This book isn't just about changing your mind; it’s about the vital importance of staying curious enough to realize when you're wrong. I loved the breakdown of the preacher, prosecutor, and politician roles we all fall into during arguments. It really highlighted how often we prioritize being right over being accurate. The practical advice on adopting a scientist’s mindset is something I’ve already started applying at work. While some examples like the Blackberry story felt a bit familiar, the overall message of intellectual humility is exactly what we need right now. It’s a fast-paced, engaging read that pushes you toward a genuine growth mindset without feeling overly academic or dry. Highly recommended for anyone feeling stuck.
Show moreFinally got around to reading this, and the section on motivational interviewing alone made it worth the purchase. It’s rare to find a book that offers such pragmatic lessons for real-life communication while still being backed by psychological research. I’ve always struggled to talk to family members who hold radically different views, but Grant’s approach changed my entire strategy. Instead of acting like a prosecutor, I’m learning to listen for their internal motivations. The conversational tone makes the pages fly by, and the illustrations throughout are a great touch for visual learners. It’s definitely a must-read for today’s polarized world. I did find the NASA case study a bit confusing—the distinction between process and outcome felt muddled there—but the personal growth aspects are top-notch. Truly a life-changing perspective on the value of being wrong.
Show moreWow, this was exactly the mental reset I didn't know I needed this year. Grant’s writing is so engaging that I finished the whole thing in two sittings, feeling genuinely energized to rethink my own career path. He doesn't just tell you to be open-minded; he provides a roadmap for how to actually do it without losing your sense of self. I loved the anecdote about the teacher who has students rewrite their own textbooks—it’s such a powerful example of active learning. The book is filled with these kinds of aha moments that make you look at your daily habits differently. While some critics say it's just common sense, the truth is that common sense is rarely common practice. This book provides the nudge needed to turn theory into action. It’s a brilliant contribution to the field and a joy to read.
Show morePicked this up because I was tired of feeling stuck in my own head, and it delivered on every front. It's rare to find a business-adjacent book that is this well-researched yet still feels like a casual conversation with a brilliant friend. The pragmatic lessons on how to embrace a growth mindset are presented through stories that actually stick with you. I especially appreciated the look at super-forecasters and why they are so much more successful than the average expert. It turns out that being willing to change your mind isn't a sign of weakness; it's a competitive advantage. This is easily a must-read for anyone in a leadership position or anyone just trying to be a better person. It’s insightful, funny, and incredibly relevant to the world we’re living in right now.
Show moreEver wonder why you’re so certain about things you’ve never actually investigated? Think Again forces you to confront that uncomfortable reality with grace and a healthy dose of humor. The way Grant describes our tendency to preach our own beliefs while prosecuting others’ views hits uncomfortably close to home. I appreciated the actionable suggestions for how to approach disagreements, especially the emphasis on asking how rather than why. It shifts the tone from a battle of egos to a collaborative search for the truth. Some of the societal-level changes discussed in the final third felt a bit optimistic, perhaps even slightly naive, given current political climates. However, the core message about the power of knowing what you don't know is transformative. It’s a thought-provoking guide for anyone looking to sharpen their mental flexibility.
Show moreThe core idea of thinking like a scientist is presented here as the ultimate antidote to the Dunning-Kruger effect. Grant illustrates this beautifully through the rise and fall of companies like Blackberry, showing how the same conviction that leads to success can eventually become a cage. I found the distinction between task conflict and relationship conflict particularly helpful for my own management style. It’s a well-researched book that manages to stay light on its feet without getting bogged down in jargon. My only real gripe is that it occasionally simplifies complex historical events to fit the central theme. The world is often messier than a 200-page book can account for. Still, the emphasis on building learning cultures is something every leader should take to heart. It’s a solid read that encourages you to keep updating your mental software.
Show moreIn an era of deep polarization, this book feels like a necessary survival guide for our sanity and our relationships. Adam Grant tackles the binary bias that plagues our social media feeds, reminding us that most issues are far more complex than a for or against stance. I found the chapter on negotiating especially enlightening; it turns out that having fewer, stronger arguments is actually more persuasive than a laundry list of points. The writing is punchy and direct, though the pacing slows down a bit toward the end when he shifts to societal changes. I would have liked to see more on how to handle bad faith actors who have no interest in the truth. Regardless, the advice on grounding your identity in your values rather than your opinions is profound. It’s a thought-provoking read that I’ll be recommending to my friends.
Show moreTo be fair, while the writing is incredibly smooth, much of the content felt like a remix of ideas I’ve encountered elsewhere. If you’ve read Range or Thinking, Fast and Slow, the firefighter parable and the focus on cognitive biases might feel like old news. Grant is a brilliant storyteller, but I occasionally felt like he was cherry-picking anecdotes to fit his rethinking narrative. For instance, the analysis of why some companies fail versus succeed felt a bit like hindsight bias in action. That said, his section on motivational interviewing was a standout and provided some actual, concrete tools for having difficult conversations. It’s a decent introductory text for personal growth, even if it lacks the depth of more specialized psychological works. I’d recommend it to someone new to the genre, but seasoned readers might find it a bit repetitive.
Show moreFrankly, I enjoyed parts of this, but I couldn't shake the feeling that Grant was stretching his metaphors a bit thin. The argument that NASA failed because of a results-oriented culture felt like a massive oversimplification of a very complex engineering disaster. It’s easy to look back in hindsight and say people should have rethought their decisions, but foresight is a different beast entirely. On the positive side, the breakdown of how to win a debate by finding common ground was excellent and very practical. The book is written in a very accessible, conversational tone that makes the psychology feel relevant to everyday life. It’s a good book for a weekend read, but don’t expect it to solve every cognitive hurdle you face. It’s more of a motivational primer than a deep-dive manual into the mechanics of the human mind.
Show moreAs an engineer who thrives on data-driven proof, I found myself frustrated by the lack of scientific rigor in some of these chapters. Several of the studies cited felt poorly designed or were presented with far more confidence than the data actually warranted. For example, the claim about pollsters and the 2016 election felt factually shaky and undermined the author's credibility for me. I’m already in an environment where we constantly seek evidence that our designs are wrong to make them better, so the scientist mindset isn't exactly a revelation. The book leans heavily on motivational platitudes rather than providing the rigorous cognitive tools needed for complex decision-making. If you're looking for something with more meat, I’d suggest sticking to Taleb or Dalio. It’s a light read, but for those in technical fields, it might feel a bit shallow.
Show moreQuestions about this book
What is the main idea of Think Again by Adam Grant?
Grant argues that good judgment depends on the willingness to rethink, not just on intelligence. He urges readers to treat beliefs like a scientist treats hypotheses, testing them against evidence and updating them when the world changes. He shows the cost of certainty through BlackBerry’s collapse and the Columbia shuttle disaster, and the payoff of humility through negotiators, a doctor and a musician who changed minds by asking questions.
How does Think Again suggest changing someone's mind?
Grant describes skilled negotiators who find common ground, use fewer but stronger arguments and end about one comment in five with a question. He also highlights motivational interviewing, used by Dr. Arnaud Gagneur in Quebec: ask open-ended questions, reflect back the person’s fears, and stress that the choice is theirs. For prejudice, Daryl Davis asked Klan members what they would believe had they been born into another family.
What does Think Again say about team culture and psychological safety?
Grant contrasts performance cultures, which demand flawless results and punish failure, with learning cultures, where growth comes first and rethinking is routine. He links NASA’s performance culture to the Columbia disaster. Psychological safety lets people admit errors so they get fixed. His research on Silicon Valley teams found the best ones argued about tasks, especially early, while avoiding personal dislike.
Who should read Think Again?
It suits people who want better judgment and better conversations: professionals who struggle to persuade colleagues, leaders who want teams that report problems early, and founders whose strategy may rest on untested beliefs. It also helps anyone facing deeply held views, from vaccine fears to prejudice, who wants a calmer, more effective way to talk.
What is the key takeaway from Think Again?
Define yourself by your values, not your beliefs. When your identity rests on opinions, every challenge feels like an attack and you defend positions even after the evidence turns. Values such as fairness, integrity or excellence can stay constant for life, while your beliefs about how to serve them can change. That makes rethinking feel like growth rather than defeat.
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