“There is only one most important thing in every project, goal, and company. If you have two or more most important things, you’re not thinking clearly. This is an important aspect of leadership and problem-solving in general: you have to pick one criterion above all the others and communicate it in a way that your people can understand so they can make decisions on their own.”

You must know what is the most important thing for you when using your selection criteria.If you don’t know what it is, then you don’t fully understand the problem yet.One way to find the most important thing is by listing down all the criteria, then compare in pairs (one-to-one) which criteria is more favorable when it’s true. Do it for all criteria until we find the ultimate winner.

Most Important Thing

The quality of your decisions is directly related to the quality of your thoughts. The quality of your thoughts is directly related to the quality of your information.

High quality information comes from experts. There are ways to approach them effectively:<ol><li>Show that you have skin in the game</li><li>Be precise on what you’re asking</li><li>Show respect for their time and energy</li><li>Listen to their reasons</li><li>Follow up and keep them updated</li></ol>Experts love sharing what they know especially if it makes difference. Helping others make their life meaningful and they also enjoy doing what they’re good at.

How To Get Help From Experts

When deciding between several options, you must have specific evaluation criteria with these features:<ul><li>Clarity: criteria must be clear, simple, and easily understood</li><li>Goal Promotion: criteria must favor options that achieve desired goal</li><li>Decisiveness: criteria must favor exactly one option.</li></ul>For example, you want to live in suburb and look for new job. You can use the following criteria:<ul><li>Increased take home pay at least 30% (Clarity, Decisiveness)</li><li>Allow work-from-home (Goal Promotion)</li><li>You believe you can make impact in the first 90 days (Decisiveness)</li></ul>

Criteria for Evaluating Options

Quality of your decision is determined by the quality of information you have. Most information is irrelevant. High quality information is both accurate and relevant.Seek information from direct source. Run your own experiments. Learn from the real expert, not imitator or popularizer. Evaluate motivation and incentives of your source, because everyone has their own perspectives.

Information You Need

At certain point, you must stop looking for more information and start taking action.It depends on whether the decision is reversible or not and to what extent the outcome is consequential.Take action based on the following rules:<ul><li>ASAP (as soon as possible): if the cost to undo the decision is low</li><li>ALAP (as late as possible): if the cost to undo the decision is high</li><li>FLOP (first lost opportunity): if we start losing options</li></ul>For example, decide ASAP what to eat for breakfast, decide ALAP where to live, and be aware of FLOP when you choose where to have internship.

When To Take Action

We’re making decision mostly to get what we want, but it’s equally important for us to know whether what we want is the right thing.In the end, it’s about what matters in life. We all want a happy, fulfilling and enjoyable life. We need to think deeply on whether what we pursue align with our ultimate goal.

Wanting The Right Thing

Things don’t always go as planned. You need to have a buffer between what we expect to happen and what could happen. That’s margin of safety.Engineers build a bridge to sustain more than double its maximum capacity. Investors only choose business they understand so that they can calculate the margin of safety. You need to save for rainy days.

Have Margin of Safety

“Good judgment is, above all else, about being effective at achieving what matters—not what matters in the moment, but what matters in life.”

Once we’ve build the strength to create space for thinking, then we can apply clear thinking to make decision.Decision is a judgment that certain option is the best one.Decision making process is as follow:<ol><li>Define the problem</li><li>Explore potential solutions</li><li>Evaluate the options</li><li>Make the judgment</li><li>Execute the best option</li></ol>

Decision Making Process

To overcome our defaults and improve our thinking, we must build strength to make a space for thinking between a situation and our response.We need make it a habit and use inertia default for our benefit. Here are the source of strengths to be developed:<ul><li>Self-accountability (holding ourselves accountable for our actions)</li><li>Self-knowledge (knowing our strengths and weaknesses)</li><li>Self-control (mastering our emotions)</li><li>Self-confidence (trusting our abilities)</li></ul>

How To Build Strength

“Making a good decision is about the process, not the outcome. One bad outcome doesn’t make you a poor decision-maker any more than one good outcome makes you a genius. Unless you evaluate your reasoning at the time you made the decision, you’ll never know whether you were correct or just lucky.”

“In the space between stimulus and response, one of two things can happen. You can consciously pause and apply reason to the situation. Or you can cede control and execute a default behavior.”

“There is a gap in our thinking that comes from believing that the way we see the world is the way the world really works. It’s only when we change our perspective—when we look at the situation through the eyes of other people—that we realize what we’re missing.”

Our biggest problem with thinking is that we’re not really thinking in the situation where judgment is needed. We are reacting automatically based on our natural tendencies:<ul><li>Emotion default (responding to feeling rather than reason and fact)</li><li>Ego default (protecting our self worth and position in hierarchy)</li><li>Social default (conforming to social norms)</li><li>Inertia default (seeking comfort and familiarity)</li></ul>

The Problem with Thinking

“In order to be right, you must be willing to change your mind. If you’re not willing to change your mind, you’re going to be wrong a lot. The people who frequently find themselves on the wrong side of right are people who can’t zoom in and out and see the problem from multiple angles.”

Most people evaluate decision based on its outcomes, but they forget that there are outside factors, such as luck.Quality of a decision is determined by the process and the reasoning used when the decision is made.To evaluate your decision we need to make it visible by writing down your thoughts when you make the decision. Then you can evaluate whether the result is aligned with your expectation or not.For example, a good trader usually keeps a trading journal to record each trade and reasoing behind it. This way allows them to learn what works and improve their trading skill over time.

Learn from Your Decisions

This book is great because of its simplicity. For some readers, the ideas may not be new, but I think it’s because they’re true and proven to be effective. I am sharing here what’s most interesting to me plus additional examples to make it easier to understand.

The instant New York Times bestseller 'An indispensable guide' James Clear, author of Atomic Habits 'A game-changer' Morgan Housel, author of The Psychology of Money 'A must-read' Mark Manson, author of The Subtle Art of Not Giving a F*ck 'A masterwork' Ryan Holiday, author of The Daily Stoic We all want to see the world clearly. The trouble is, we're never taught how. Join Shane Parrish - 'the former spy who helps Wall Street mavens think smarter' (New York Times) - for a masterclass in the art of clear thinking. Drawing on examples ranging from the evolutionary origins of our 'emotion default' to the secret history of the Challenger disaster, Parrish offers powerful mental models to make sense of any situation. And he reveals a simple, actionable method for smarter decision-making, starting today. Along the way, he shows that the secret to mental clarity lies not in how we approach the most high-stakes moments - but in our tiniest, most everyday decisions. It's a simple idea with startling implications: if you clear your head today, you change your life tomorrow. _ 'Incisive. Practical. Full of vivid examples, and enormously fun to read.' Jim Collins, author of Good to Great 'Shane Parrish doesn't just teach clear thinking - he lives it.' Adam Grant, author of Originals 'If you want results - good ones - that you can achieve confidently again and again, read this book.' Annie Duke, author of Quit

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