Essential Insights: Sixteen World-Class Thinking Models

Thinking models can increase the likelihood of success.

Thinking models provide you with a perspective or mental framework, shaping how you observe and interpret the world. The most powerful thinking models can increase your chances of success and help you avoid failure.
The idea of building a diverse toolkit of mental models comes from Charlie Munger, Warren Buffett’s trusted partner. Farnam Street once described mental models as follows: “A mental model is the toolbox your brain uses to make decisions. The more tools you have, the better equipped you are to make sound choices.” Whether you’re making major decisions, leading a team, or crafting a market strategy, mental models can play a crucial role. Michael Karnjanaprakorn, founder and CEO of SkillShare, shares the 16 top‑tier mental models he relies on most in running his company and managing his team.

01 Make decisions
1. Warren Buffett’s Dual-Goal Checklist System ( Two-List System) Mike Flint served as Warren Buffett’s personal pilot for ten years and even flew for four U.S. presidents, yet he still harbored greater ambitions in his career. Once, while discussing his professional goals with Buffett, the latter asked him to do something specific: First, Buffett instructed Flint to write down his 25 most important career objectives. After taking some time to jot them down, Buffett then asked Flint to review the list and circle the five he considered most critical. Flint complied. He now had two lists: one containing his top five career priorities, and another listing twenty additional goals he also regarded as significant. Buffett turned to Flint and asked, “Do you know what to do now?” Flint replied, “Yes. I’ll start working on those five goals right away. As for the other twenty, they’re not urgent, so I can tackle them in my spare time and gradually bring them to fruition.” Upon hearing this, Buffett said, “No, Flint—you’ve got it wrong. Those goals you didn’t circle aren’t things you should pursue slowly in your free time; rather, they’re tasks you ought to avoid at all costs—shun them as if they were a plague, and don’t waste a single moment or ounce of attention on them.” This reminded me of three things: 1. Having goals is extremely important. Only when you have a concrete goal can you systematically map out the methods and pathways to achieve it, and only then will you know, upon waking each morning, what to prioritize and strive for. Another excellent approach I’ve heard is to turn open-ended questions into closed‑ended ones. Meanwhile, the notion that “anything goes” or that “every direction is a viable path” is the most dangerous—whether for an individual or for a company. 2. Focus is powerful. When an individual’s cognitive resources are limited, setting too many goals at once often leaves none of them within reach. Although the concepts of “focus” and “prioritization” have been widely discussed in modern times, only a small minority truly manage to accurately identify their desires and eliminate what they don’t genuinely need. 3. Compared to “doing something,” “refraining from doing something” may be even more crucial. This may be related to what Munger said: “ “Invert, always invert” shares a common thread. The 20 goals that weren’t chosen are, in fact, things you’re also interested in or find meaningful, so it’s easy to come up with all sorts of rational excuses to spend time on them. Yet these are precisely the tasks that quietly drain your time, distract you, and fail to deliver real results—making them even more dangerous than those that seem obviously foolish at first glance. 2. The 10/10/10 Rule Most of us encounter a common problem when making decisions: we fail to consider the long-term consequences of those choices. In such cases, you can base your decision on… Consider the long-term implications of the decisions you make by applying the 10/10/10 rule. This principle states:

• This decision is in What impact will there be after 10 minutes?
• This decision is in What impact will there be after 10 months?
• This decision is in What impact will it have in 10 years?

When making decisions, applying the 10/10/10 rule can help you avoid being swayed by emotional factors, compel you to consider the long-term implications of your choice, and ultimately lead to more informed and wise decisions. 3. Ignore the results (Do not judge the correctness of a decision based on its outcome.) Annie Duke, a top poker player known as the “Poker Duchess,” puts it this way: “The biggest trap many people fall into is judging performance by the results. If they win, they assume they made the right decisions; if they lose, they blame bad luck. For the first half of my life, I was an extremely competitive poker player. That taught me one of the most important lessons about decision‑making—and today, I bring that insight into the business world.” When making decisions, you can’t possibly have all the information at your disposal. Even so, you can still take control of the decision‑making process. Whenever I face a major decision, I seek advice and feedback from those around me—my management team, the board of directors, employees, customers, and others. This allows me to understand everyone’s perspective, and the decision‑making framework I’ve developed helps me promptly mitigate risks. Whether things are going exceptionally well or terribly poorly, maintaining consistency is crucial—it helps you avoid attribution bias. By adopting an approach that “ignores the outcome” when evaluating decisions, you increase your chances of making high‑quality choices.

4. Correctness and Non-Consensus

Ray Dalio, the founder of Bridgewater Associates—one of the world’s most prestigious hedge funds and a leading financial titan—argues that everyone makes countless decisions every day, each of which carries consequences. Fundamentally, your quality of life hinges on the quality of those decisions. To succeed in the markets, you must think independently, because consensus is often wrong. You need to cultivate a distinctive perspective and viewpoint. Whether in equities or entrepreneurship, success demands that you resist the herd and make the right calls. And if you aim for exponential growth, you must both break free from conventional thinking and consistently make sound decisions. Easier said than done, as most of your choices will inevitably be flawed. Yet when you do hit upon the right decision, the market rewards you in a power-law distribution: a small handful of well‑timed, correct moves can yield outsized returns. 5. The “3” Rule I learned a piece of advice from a mentor at McKinsey: the “rule of three.” When you’re trying to persuade someone more senior to take action, always present three reasons—no two, no four, just three. I’m a big fan of this principle. Whether I’m prioritizing tasks or making recommendations, I use it as a guiding framework.

02 Strategy

6. Competitive moat

In ancient times, castles were typically surrounded by moats, which served to protect them. The wider the moat, the better the castle was safeguarded, as it became much harder for enemies to breach its defenses. Conversely, if the moat was too narrow, it offered little protection, since attackers could easily cross it and storm the fortress. In Buffett’s view, a castle is like a company, and the moat represents that company’s competitive advantage. He hopes his managers will continually widen the moat around their “castles.” I particularly like the diagram above, because it clearly illustrates what kinds of moats a company can have. You’ll find that… Facebook has essentially erected all the moats shown in the diagram around itself—high switching costs, network effects, and economies of scale. When evaluating competitive advantages and strategies, it’s crucial to consider what kinds of moats you’ll build going forward. Doing so will enable your company to fend off competitors and secure lasting success.

7. Network Effects and Critical Mass The network effect refers to the phenomenon where, as the number of users of a product increases, its value to each user also rises, which in turn attracts even more users to adopt the product. Moreover, the product’s value grows quadratically with the number of users—this is famously known as… “Metcalfe’s Law”: The value of a product is proportional to the square of its number of users. No business can scale as rapidly as the software industry, and no force builds a company’s competitive moat more effectively than network effects. Network effects have become a key strategic asset. Typically, once a company reaches a critical mass of users, triggering network effects, it can leverage economies of scale to gain substantial cost advantages. Because network effects are so pronounced, first‑mover innovators may achieve a winner‑takes‑all outcome—precisely the dream of every entrepreneur. 8. Centralized, Decentralized, and Distributed “Blockchains are politically decentralized—no one controls them—and architecturally decentralized—there is no central infrastructure—but logically centralized—there exists a universally agreed-upon state, and the system behaves as if it were a single computer.” — Vitalik Buterin, co‑founder of Ethereum To achieve network effects, one key ingredient is establishing a distributed and decentralized model that empowers individuals. Once you grasp the distinctions among centralized, decentralized, and distributed systems, you’ll gain a clearer understanding of how Bitcoin and its underlying blockchain technology actually work. 9. Game Theory “Game theory examines how people behave in strategic situations. Here, ‘strategy’ refers to the way each player in an equal contest adjusts their own course of action in response to the other’s moves, with the goal of securing victory. Strategic thinking is not only essential in games like checkers, chess, and card games but also plays a critical role in many business decisions.” — Economist Greg Mankiw sums up game theory in a single sentence: choose a strategy that minimizes your competitor’s maximum advantage. 10. Economies of Scale Economies of scale refer to the ability of a company to achieve exponential growth in its operations while keeping costs or administrative expenses constant. Startups in the software industry are among the biggest beneficiaries of economies of scale. For example, Companies like Google, Facebook, and Twitter can acquire more users without incurring any additional fixed costs. By contrast, service‑based companies find it much harder to achieve scalable growth. Let’s take Amazon as an example to see how economies of scale operate within its business: Amazon AWS’s “Flywheel”

03 Leadership

11. The Pyramid Principle According to the Pyramid Principle, ideas should be organized into a pyramidal structure. The three core principles of the Pyramid Principle are:

• Let’s start with the answer.
• Group and summarize your supporting arguments.
• Arrange your supporting arguments in a logical order.

When thinking about communication, I always refer to the Pyramid Principle. Instead of gradually revealing the answer, I start by stating the conclusion upfront; this helps reach a decision more quickly, ensures everyone is on the same page, and fosters open, honest dialogue. 12. 99/50/1 framework You can use this framework to determine the optimal times to review progress with your product team. I personally apply this approach in my own company. If you’d like to adopt it, schedule check-ins at these key milestones: - At the very start of the project, when 99% of the work remains unfinished. - Midway through the project, when roughly 50% of the work is still pending. - Near the end of the project, when only 1% of the work remains. My favorite mantra is: “Sync on progress early and often.” In other words, get heavily involved at the outset, then gradually step back as the project progresses. 13. Directly Responsible Individual (DRI) Apple has pioneered a management concept known as the Directly Responsible Individual (DRI). DRIs are embedded at every level of the organization. At Apple, there’s never any confusion about who’s accountable for what. The DRI’s name is routinely listed on meeting agendas, ensuring that everyone knows exactly who bears direct responsibility. This open and transparent accountability system leaves no room for finger-pointing or shirking; when issues arise, it’s easy to pinpoint the root cause and take corrective action, while holding the relevant parties accountable. Moreover, each project can have only one DRI—having more than one effectively means there’s no clear point of responsibility. DRIs not only streamline decision-making but also help cut down on unnecessary meetings. 14. Teams within a Team A team of teams is an operating model that brings together diverse teams and their members to form a seamless organizational network. In this structure, decision-making authority is delegated to the leaders of each individual team, rather than being concentrated in the hands of top-level executives. As a result, the role of senior leadership shifts: instead of making all decisions for the entire organization, they now provide each team with the information and context it needs, aligning everyone around a shared objective and equipping them with the best possible insights to inform their decisions. 15. Utterly Honest Throughout her entire career, Kim Scott has been driven by a single goal: to foster a workplace culture and environment where employees feel valued and collaborate effectively. Later, during her long tenure as a team coach at Google, she gained deep insights into how the company’s leaders cultivate an atmosphere in which employees derive genuine joy from their work—a sense of happiness so palpable it’s immediately apparent. Meanwhile, as a senior instructor at Apple University, Scott observed that while Apple’s approach differs, its underlying intention remains the same: to create a setting where people can unlock their full potential and take pleasure in their work. Today, serving as a seasoned advisor to Twitter, Shyp, Rolltape, and Qualtrics, Scott has distilled her years of experience into a simple yet powerful principle: radical candor. Every company founder can leverage this approach to help their teams love what they do and bring their best selves to the table, delivering exceptional results.

The horizontal axis above represents “Direct challenge,” in Scott’s words, means “daring to provoke the other person.” Directly challenging others is difficult for many people, as saying something unpleasant can come across as impolite. However, once you become a manager, you must clearly identify which employees are performing well and where problems lie—this is part of your responsibility. As the chart above shows, “radical candor” arises from the combination of “personal concern” and “direct challenge.” Radical candor is highly beneficial because it focuses on the issue, not the person. “In my view, when an employee makes a mistake, criticizing them is not only your duty—it’s also your moral obligation,” Scott said. 16. Listening, Decision-Making, Communication When making decisions as a manager, CEO, or leader at any level, the sequence of listening, deciding, and communicating is crucial. It’s best to follow this order: first listen, then decide, and finally communicate—while keeping the intervals between these steps as short as possible. This communication model was proposed by Dick Costolo, Twitter’s former CEO. The key is to always prioritize listening, avoid disrupting the sequence, and minimize the time lag between each step.