Flywheel Effect

One-Line Definition

Multiple components reinforce each other, making growth increasingly effortless.

Core Concept

Jim Collins proposed: Great companies are not built on one-time breakthroughs, but on continuously pushing the flywheel — each turn builds momentum for the next.

What Problems It Solves

When you face a complex problem, it helps you see the relationships between elements rather than just treating surface symptoms.

More specifically, the Flywheel Effect is suitable for answering questions like: Is what I’m seeing a fact, an assumption, or a habitual practice? If I want to make a better choice, which variable, path, or constraint should I examine first?

Fogg Behavior Model

One-Line Definition

Behavior = Motivation × Ability × Trigger. All three must be present at the same time for the behavior to occur.

Core Concept

B.J. Fogg proposed that for a behavior to happen, three elements must converge simultaneously: Motivation, Ability, and Trigger. If any one is missing, the behavior will not occur.

What Problems It Solves

When information is incomplete, options are many, or risks are unclear, it helps shift your judgment from intuition to structured analysis. More specifically, the Fogg Behavior Model is useful for answering questions like: How can you better understand the current situation? How can you make more informed judgments and take action?

Forgetting Curve

One-Line Definition

Memory decays exponentially over time—knowledge that isn’t reviewed is quickly forgotten.

Core Concept

Ebbinghaus discovered that 56% of information is forgotten after 1 hour, 66% after 1 day, and 79% after 1 month. Spaced repetition is the most effective way to combat the forgetting curve.

What Problems Does It Solve?

When information is incomplete, options are many, or risks are unclear, it helps pull your judgment from intuition back to structured analysis.

Fundamental Attribution Error: Judge the Situation Before the Person

One-Sentence Definition

The fundamental attribution error is a cognitive bias where people overestimate personal traits and underestimate situational factors when explaining someone else’s behavior.

TL;DR

• We often explain other people’s mistakes as character flaws.
• We explain our own mistakes more generously by pointing to context, pressure, or constraints.
• This bias damages teamwork, management, relationships, and user understanding.
• The fix is to ask what situational forces may have shaped the behavior before judging the person.

What Problem Does It Solve?

When someone misses a deadline, replies harshly, ignores a process, or makes a poor decision, the easy explanation is personal: they are lazy, careless, rude, or incompetent. Sometimes that may be true. But often the behavior is shaped by unclear incentives, pressure, bad information, poor tools, or conflicting constraints.

Funnel Analysis

One-Sentence Definition

Funnel Analysis breaks a journey into sequential stages so you can see where people drop off and which step most limits the final outcome.

TL;DR

• Funnel Analysis breaks a journey into sequential stages so you can see where people drop off and which step most limits the final outcome.
• Use it to turn vague discussion into clearer judgment.
• The model works only when it changes what you look for, test, or do next.

What Problem Does It Solve?

Funnel Analysis solves the problem of looking only at the final result. It turns broad complaints like low revenue or weak activation into a stage-by-stage diagnosis of where the journey breaks.

Game Theory

One-Line Definition

Thinking about the optimal strategy when others will also act and react.

Core Concept

Game theory analyzes how multiple players make optimal strategies under given rules. Core concepts include Nash equilibrium, the prisoner’s dilemma, zero-sum games, and positive-sum games.

What Problems It Solves

It helps you turn vague problems into clearer judgments, actions, and ways to verify.

More specifically, Game Theory is suited to answering questions like: Is what I’m seeing a fact, an assumption, or a habitual practice? If I want to make a better choice, which variable, path, or constraint should I examine first?

Gaslighting

One-Line Definition

By persistently denying others’ feelings and judgments, causing them to doubt their own cognitive abilities.

Core Concept

Gaslighting is a form of psychological manipulation: the perpetrator denies facts, distorts information, and questions the victim’s judgment, causing the victim to gradually lose confidence in their own perception.

What It Solves

When information is incomplete, there are many options, or risks are unclear, it helps you shift your judgment from intuition back to structured analysis.

Goal Alignment

One-Line Definition

Align the goals, metrics, and action directions of different members.

Core Concept

Help teams reduce collaboration friction and create greater consistency around goals, incentives, and trust.

More specifically, Goal Alignment is suited for answering questions like: Is what I’m seeing a fact, an assumption, or a habitual practice? If I want to make a better choice, which variable, path, or constraint should I examine first?

When to Use

• When a problem becomes complex and intuition alone is not reliable.
• When the team disagrees on the next step and needs a shared analytical framework.
• When you need to turn abstract judgments into concrete actions, checklists, or experiments.
• When existing practices are losing effectiveness and the underlying logic needs to be re-examined.

When NOT to Use

• The problem is simple; direct execution matters more than analysis.
• You lack basic facts and are merely spinning concepts in the air.
• The model is used only to justify an existing conclusion rather than to help correct your judgment.
• The cost is extremely high and you cannot afford trial and error, yet you have no additional means of verification.

How to Apply

1. Write down the current problem: Describe what you need to judge or solve in one sentence.
2. List existing assumptions: Separate facts, opinions, past experience, emotions, and default answers given by others.
3. Identify the key variables: Find the 1–3 factors that most influence the outcome.
4. Formulate alternative actions: Propose several different approaches based on those key variables.
5. Define a minimal verification: Use a low-cost action to test which judgment is closer to reality.

Example

Suppose a team discovers that new user conversion is declining. Instead of immediately asking the designer to change a button or the marketing team to increase the budget, using Goal Alignment they first deconstruct the situation: Where do users come from? What information do they see? At which step do they hesitate? What do they lose when they drop off? Is there a stronger alternative choice available? After this deconstruction, the team may find that the real problem is not insufficient traffic, but that users do not understand what problem the product solves on the first screen. The minimal action, therefore, is not to rebuild the entire product, but to test a clearer value proposition first.

God’s Eye View

One-Line Definition

Step out of your personal perspective and look at the problem from a higher, big-picture view.

Core Concept

God’s Eye View means examining the whole picture from a vantage point beyond personal interests and limitations, seeing not only yourself but also others and the environment.

What Problems It Solves

When information is incomplete, options are numerous, or risks are unclear, it helps pull your judgment from intuition back to structured analysis.

Golden Circle

One-Line Definition

Start with why, then how, and finally what.

Core Concept

The Golden Circle model proposed by Simon Sinek: Most people start from the outer layer (What), but great leaders and organizations start from the inner layer (Why).

What Problems It Solves

When information is incomplete, there are many options, or risks are unclear, it helps you shift your judgment from intuition to structured analysis.

More specifically, the Golden Circle is suitable for answering questions like: How can I better understand the current situation? How can I make more sound decisions and take appropriate actions?

Growth Breakthrough

One-Line Definition

Break through existing cognitive and capability boundaries to enter a larger growth space.

Core Concept

Growth Breakthrough requires us to proactively step out of the comfort zone, break through existing cognitive boundaries and upper limits of capability. Breaking through the circle means abandoning old security and embracing uncertainty.

What Problem It Solves

When information is incomplete, options are many, or risks are unclear, it helps pull your judgment from intuition back to structured analysis.

Growth Mindset

One-Sentence Definition

Growth Mindset treats abilities as improvable through effort, strategy, feedback, and learning.

TL;DR

• Growth Mindset treats abilities as improvable through effort, strategy, feedback, and learning.
• Use it to make judgment more concrete and less reactive.
• Apply it with clear evidence, boundaries, and next actions.

What Problem Does It Solve?

Growth Mindset solves the problem of fixed identity around performance. It reframes poor performance as information about strategy, feedback, practice, and context.

Hanlon’s Razor

One-Line Definition

Never attribute to malice that which can be adequately explained by ignorance, negligence, or misunderstanding.

Core Concept

It helps you identify blind spots, biases, and oversimplifications in your thinking.

More specifically, Hanlon’s Razor is suited to answer questions like: Am I seeing facts, assumptions, or habitual practices right now? If I want to make a better choice, which variable, path, or constraint should I examine first?

Heuristic Bias

One-Line Definition

Mental shortcuts the brain uses for quick decision-making, often leading to systematic judgment errors.

Core Concept

Heuristics are the brain’s shortcuts—effort-saving but error-prone. Common ones include the availability heuristic, representativeness heuristic, anchoring heuristic, and others.

What It Solves

When information is incomplete, options are numerous, or risks are unclear, it helps pull your judgment away from intuition and back toward structured analysis.

Hook Model

One-Line Definition

Form user habits through a four-step loop: Trigger → Action → Reward → Investment.

Core Concept

The Hook Model proposed by Nir Eyal: Trigger → Action → Variable Reward → Investment, repeating in a cycle to form habits.

What Problems It Solves

When information is incomplete, options are numerous, or risks are unclear, it helps pull your judgment back from intuition to structured analysis.

More specifically, the Hook Model is suited for answering questions like: How can I better understand the current situation? How can I make more rational judgments and take better actions?

Hypothesis Testing

One-Sentence Definition

Hypothesis Testing turns an assumption into a falsifiable claim, then uses evidence to decide whether to keep, revise, or reject it.

TL;DR

• Hypothesis Testing turns an assumption into a falsifiable claim, then uses evidence to decide whether to keep, revise, or reject it.
• Use it to turn vague discussion into clearer judgment.
• The model works only when it changes what you look for, test, or do next.

What Problem Does It Solve?

Hypothesis Testing solves the problem of treating assumptions as facts. It forces a team to ask what evidence would support or weaken a belief before committing major resources.

ICE Priority

One-Sentence Definition

Quickly prioritize opportunities using Impact, Confidence, and Ease.

What Problem Does It Solve

It helps you turn plans into actionable, verifiable, and correctable actions.

More specifically, ICE Priority is suitable for answering questions like: Is what I’m seeing a fact, an assumption, or a habitual practice? If I want to make a better choice, which variable, which path, or which constraint should I look at first?

Iceberg Theory

One-Sentence Definition

The truth of things is like an iceberg—only a small part is visible above the surface, while most of it lies hidden beneath.

Core Concept

The iceberg theory reminds us that what we see on the surface is only a small part of the problem. Deeper causes, system structures, mental models, and other factors remain submerged below the waterline.

Imbalance

One-Sentence Definition

The development of things is inherently unbalanced; understanding imbalance is the key to finding leverage points.

Core Concept

The world is not evenly distributed; most results come from a few causes. Understanding imbalance helps you identify the critical few.

What Problem Does It Solve

When information is incomplete, options are numerous, or risks are unclear, it helps pull your judgment from intuition back to structured analysis.

More specifically, imbalance is suited for answering questions like: How can I better understand the current situation? How can I make more reasonable judgments and take action?

Implicit Premises

One-Sentence Definition

Every conclusion is built upon premises; identifying the unspoken, implicit premises is key to rational thinking.

Core Concept

An implicit premise is an assumption that is not explicitly stated in reasoning but is taken for granted as true. Many erroneous conclusions stem from invalid implicit premises.

What Problem Does It Solve

When information is incomplete, options are numerous, or risks are unclear, it helps pull your judgment back from intuition to structured analysis.