PDF Summary:The One Thing, by Gary Keller

Like most people, you probably juggle multiple priorities and often feel overwhelmed by everything on your to-do list. But what if you didn’t have to do more to succeed? In The ONE Thing, real estate entrepreneur Gary Keller argues that uncommon success comes not from doing more, but from doing less. He contends that by identifying and focusing on the single most important thing you can do right now, you’ll achieve better outcomes.

In this guide, we’ll explain why conventional productivity advice about multitasking and work-life balance actually holds you back, and we’ll show you how to implement Keller’s “one thing” approach to create a domino effect of compounding wins. We’ll also compare his ideas to advice from other productivity experts, such as Cal Newport (Deep Work) and Greg McKeown (Essentialism).

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Focus on Your One Thing Above All

We’ve seen what conventional productivity advice gets wrong as well as what really works, according to Keller. In this section, we’ll explain how to put those ideas into action using his methodology, which we’ll call the one thing approach. We’ll further explain the basic premise—that success comes from focus—and how asking the right questions helps focus your work. Finally, we’ll detail Keller’s argument that focus creates a domino effect of compounding wins that all successful people leverage.

Uncommon Success Requires Uncommon Focus

Keller writes that if you want to achieve uncommon results, you need to have uncommon focus. Don’t spread yourself thin across competing priorities. Just identify the single highest-leverage action available to you—the one thing that’ll move you forward most effectively—and take it

How do you identify that one most important thing? By asking the right kind of question. You might ask yourself, “What one thing could I focus on that will make everything else simpler or superfluous?” This question should guide all of your plans.

(Shortform note: In Essentialism, McKeown agrees with Keller that questions help you eliminate what’s inessential and get to what matters. However, he says that essentialists ask tough questions to find essentials, plural (such as key work activities). So, according to McKeown, if there’s more than one thing you want to do—or more than one thing you have to do—take it in stride: You can focus on a small set of tasks and still get plenty done.)

Keller explains that asking and answering this question about your one thing helps you find uncommon focus on two time scales. In the long run, it helps you identify your purpose—whatever you live to achieve, or what gets you up in the morning and keeps you going when times get tough. In the short run, the question helps you identify your priority—the single task that will yield the most progress toward your purpose today.

With your purpose and priority clear, all you need to do is be productive: Execute your priority daily—in doing so, you’ll serve your purpose too. Later, we’ll explore when to ask this question, how often, and how to use it across more fine-grained time scales (like day-to-day or week-to-week).

(Shortform note: With its two scales (long-term purpose and short-term priority), Keller’s planning framework is simpler than some others, such as those built around vision, mission, strategy, tactics, goals, and other categories. Keller’s three key “p” terms—purpose, priority, and productivity—may also be easier to remember, especially if you visualize how they interact. Etymologically, purpose defines a goal, while productivity suggests forward motion. Add to this priority, which refers to what comes first, and the resulting image is that of a distant goal (your purpose) at the end of a long road of tasks (your priorities) that you’ll need to complete so you can continue moving forward (productivity) toward your goal.)

Focus Creates Momentum

Why does asking this question accomplish what conventional productivity doesn’t? Because it forces you to focus intensely, which gives you momentum in doing the work that matters.

Keller says that focusing on your one thing is like knocking over dominoes: One small action sets off a chain of events that compound into increasingly larger results. He references a 1983 study showing that one domino can knock down another domino that’s 50% bigger. Starting with a 2-inch domino, the effect grows exponentially: The 13th would be as tall as a two-story house (~21 feet), and the 40th would reach the International Space Station’s orbital distance (250mi/400km).

In other words, doing the right small thing now sets up the next right thing, which sets up the next, creating momentum that compounds over time and helps you achieve your goals sooner.

(Shortform note: The domino study Keller references was presented by physicist Lorne Whitehead in 1983 as an example of chain reactions and exponential growth. But it may not be accurate to say that when you topple a metaphorical domino—for instance, by making a crucial hire—things will just take off. Literal dominoes lined up are a simple, closed system, but the world is a complex, open system where actions often generate unpredictable effects. For instance, during the Cold War, US Presidents Truman and Eisenhower espoused the “domino theory” that if single countries “fell” to communism, neighboring areas would follow. As history shows, though, some countries “fell,” others didn’t, and still others were hotly contested.)

Using Keller’s question to find your focus also gives you a leg up on the competition. According to Keller, anyone who achieves notable success owes it to intense focus on their one thing. Take Reed Hastings, the CEO of Netflix. Hastings believed as early as the late 1990s that DVDs would become obsolete and that the internet would deliver content into people’s homes. He built Netflix with the belief that they would succeed by doing one thing—delivering content via streaming—exceptionally well.

(Shortform note: Focus probably is a necessary ingredient in success, but to think it’s sufficient is to fall prey to survivorship bias. This cognitive bias causes us to overvalue the stories of those who succeed (“I did it by focusing!”), while ignoring the fact that many who failed may have taken a similar approach (“We tried that too…”). For every person who succeeds, there are many more who also focused and worked hard but, in the end, didn’t find success. Don’t take this as a reason not to focus—but realize that many other factors, like luck and your relative social standing, also play a large role in who makes it and who doesn’t.)

Putting The One Thing Into Practice

We’ve covered what conventional productivity advice gets wrong as well as Keller’s approach to success—focusing on your one thing. In this section, we’ll turn to practicalities, describing how to implement Keller’s one thing approach by committing to your success, systematically asking the focusing question, and building a plan around the answers.

Commit to Your Success

Keller writes that for the one thing approach to work properly, you need to commit to your success by following three general principles. We’ll describe each below.

First, always model yourself on the best of the best. Keller says that just working harder isn’t enough. You should also work smarter by constantly studying how the top performers in your field approach their craft and emulating their strategies so you can continually improve.

(Shortform note: Author and coach Tony Robbins (Awaken the Giant Within) agrees that you should find the best role models you can—people who walk the walk—and study them. Look at how they make choices, how they behave, and the principles they live by. Robbins adds that you should seek out a mentor, because direct attention from someone who cares about you and your success will accelerate your progress more than if you only study figures you admire.)

Second, stay accountable. Keller says that to maintain focus, you have to be accountable both to yourself and others. Track your progress and publicly share your purpose (your long-term goal) or your priorities (your short-term goals).

(Shortform note: In How to Change, economist Katy Milkman writes that we struggle with accountability because we prefer instant gratification over long-term effort. She recommends using accountability mechanisms like hard commitments, such as giving money to a service that’ll keep it if you break your commitment. Or, try soft commitments, such as finding accountability partners—people who will check your progress and help you maintain your commitment.)

Third, persevere until mastery. When following the one thing approach, your focus should be mastery—becoming truly exceptional. Mastery takes time, often years or decades of focused practice, so stay on the path for the long haul.

(Shortform note: Robert Greene agrees with Keller, writing in Mastery that achieving the extraordinary requires a lifelong commitment to continual growth and discovery. He says that aspiring masters go through three stages—foundational training, creative independence, and mastery—and that they follow their natural inclinations to find and act on what makes them feel most alive. This might take a lifetime, but in the end, masters actually feel younger for having committed to their paths.)

Implement the One Thing Systematically

With the right mindset in place, it’s time to identify and execute your one thing. We’ve organized Keller’s approach into three parts—asking a powerful question, finding a powerful answer, and asking the question at different time scales.

Ask a Powerful Question

As we discussed earlier, Keller’s approach centers on asking yourself to identify the one thing that will make everything else simpler or superfluous. But to get a great answer, it’s not enough to just ask yourself what your one thing is—you need to ask it while thinking both ambitiously and concretely.

Thinking ambitiously pushes you toward high-leverage outcomes rather than incremental improvements. For instance, asking “What’s the one thing I can do to lose one pound?” is too small—it won’t provide the fuel to fight for meaningful results. Instead, try: “What’s the one thing I can do to drop all my winter weight and get fit for the summer?”

Thinking concretely means considering the real constraints—like timeframes or measurable outcomes—that tell you exactly what you’re aiming for. A question like “What’s the one thing I can do to get healthier?” is vague, but a question like “What’s the one thing I can do to stop eating sugar?” is specific and will lead to concrete results.

(Shortform note: Keller isn’t alone in stressing the importance of asking the right questions. In A More Beautiful Question, Warren Berger argues that asking the right questions is the basis of learning and creativity. Berger emphasizes a simpler sort of question, though, saying that the most useful questions are those we asked as children: Why? What if? How? Consider asking these questions to help you confirm whether your one thing is ambitious and concrete enough. Use “What if?” to expand your aim (think bigger about what’s possible), use “Why?” to test whether your one thing is truly high-leverage, and use “How?” to make sure it’s concrete enough to translate into your next steps.)

Find a Powerful Answer

Once you’ve asked a powerful question, writes Keller, you face the challenge of finding a powerful answer. He says that most people settle for answers that are either manageable (within their current knowledge and skills) or challenging (at the edge of their current abilities). But to achieve uncommon success, you need to find an answer that’s both challenging and possibly manageable—something you can barely conceive of yet, but that you might achieve if you focus intensely enough. For instance, if you’re an aspiring writer looking for your one thing, your answer might be to innovate a new literary form beyond books, essays, or anything that currently exists.

To find these kinds of answers, look back to those top performers that Keller said you should emulate. Use their success as a benchmark for yours: Considering how much they’ve achieved, what might you be able to do? Extrapolate outward, either by imagining how you can improve on what the best performers are doing or by finding an entirely new direction.

(Shortform note: If you can’t quickly answer what your one thing is, that isn’t necessarily a bad thing. Berger writes that in fact, questions we can’t easily answer are the basis of creativity. When the answer is nebulous or unknown, we have to spend more time curiously pursuing the question, which Berger says can lead to artistic breakthroughs or scientific discoveries (if your question is ambitious enough). This creative thinking can prompt you to find novel ways to achieve your aims, helping you outperform current masters, or it could lead you to discover entirely new aims, prompting you to pursue a direction top performers haven’t yet considered.)

Ask the Question at Different Time Scales

Keller explains that asking the question to identify your one thing should become something you do all the time, at multiple time scales. First, to identify your purpose, you should ask it on as large a time scale as possible—imagining the overall one thing that you might someday achieve. Then, to find your priorities at each time scale, Keller recommends asking what your immediate one thing is at the start of each year, month, week, and day. Each answer cascades from the level above, creating a clear line of sight from your biggest vision down to your immediate action. This ensures that your daily actions connect with your purpose and that you’re always working on the highest-leverage activity at every time scale.

(Shortform note: Keller’s advice parallels that of other productivity experts. For instance, David Allen (Getting Things Done) recommends using six “horizons of focus” to organize your life and work across multiple time scales: purpose (lifetime), vision (three to five years), goals (one to two years), areas of focus and projects (this year), and daily actions. Like Keller, he writes that the highest level—purpose and values—should inform the lower levels. Unlike Keller, he emphasizes that insights can also flow bottom-up: Through regular weekly reviews of your projects and daily actions, you may discover that one of your goals, or even your vision, needs adjustment.)

Time-Block Your One Thing

Once you’ve identified your overall one thing (purpose) and immediate one thing (priority), it’s time to get productive. To do this, Keller advocates for time-blocking—scheduling a specific period each day to dedicate exclusively to your one thing. Block out around four hours, ideally in the morning when your willpower is highest. Treat this block as a non-negotiable commitment that you won’t violate for anything. Then, work hard every single day on that day’s one thing.

(Shortform note: In Deep Work, author and professor Cal Newport also recommends time-blocking. He writes that it’s one of four schedules you can use to do deep work—intensely focused effort on challenging tasks—and that time-blocking is the most practical for daily life. Newport also recommends that if you’re a novice, you shouldn’t expect yourself to do more than one hour of deep work at the start. Over time, you might be able to build up to Keller’s recommended four, which Newport says is achievable for experts with extensive practice.)

Keller lists four ways to make time-blocking more effective:

• Mark your time blocks on your calendar. Make the time you’ve committed to working on your one thing a recurring appointment. This signals to yourself and others that this time is non-negotiable.
• Seclude yourself. Eliminate all distractions during your blocked time. Turn off notifications, close your email, silence your phone, and work in a location where you won’t be interrupted.
• Protect your time blocks fiercely. When people request your time during your blocked period, practice saying no. You don't need to explain; just treat it like any other unmissable obligation.
• Stay healthy. To focus on your one thing, you need a solid physical and mental foundation. Treat health as a non-negotiable and always take care of yourself. Sleep, nutrition, exercise, and close relationships shouldn’t be sacrificed for your one thing.

(Shortform note: Like Keller, Newport suggests using a calendar, but he adds that you should specify in advance exactly where you’ll work and what rules you’ll follow during deep work sessions—for instance, removing probable distractions like your cell phone. As for protecting your time, Newport isn’t as direct as Keller: He says that when someone asks you for something that would infringe on your deep work, you should give them a vague answer that makes it hard for them to insist. Regarding health, Newport emphasizes that recovery isn’t optional—you need to give your brain time off for it to rest and be ready for your next session of deep work.)