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People, books, and breakthrough ideas—connected to the mental models and moves you can use.

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Mental Model

Marie Kondo Decluttering Method

Marie Kondo's KonMari method shifts the criterion from 'should I discard this?' to 'does this spark joy?' The method follows a specific sequence: clothes, books, papers, miscellaneous, sentimental items—ordered from easi…

Cognitive Move

Mark nondelegable

Before you hand work off, flag the parts where you personally doing them is part of the result, and keep those.

Mental Model

Market Power

Market power is the ability to sustain prices or other terms above a competitive benchmark because competitive constraints are limited

Mental Model

Markov Convergence Theorem

A standard finite-state Markov convergence theorem states that an irreducible, aperiodic chain with fixed transition probabilities approaches a unique stationary distribution independently of its initial distribution

Mental Model

Markov Model of Democratization

A Markov model of democratization represents transitions among explicitly defined regime states using specified probabilities

Mental Model

Markov Models

A Markov model represents next-state probabilities using a current state assumed sufficient for that prediction

Mental Model

Maslaha (Public Interest Principle)

Maslaha is the Islamic legal principle that the public interest or common good can serve as an independent basis for legal rulings, even when no specific textual authority exists

Mental Model

Maslow's Hammer

Abraham Maslow's observation: 'If the only tool you have is a hammer, everything looks like a nail.' The tendency to over-rely on familiar tools, frameworks, or approaches regardless of the situation—because the tool you…

Mental Model

Maslow's Hierarchy of Needs

Abraham Maslow's motivational theory that human needs are arranged in a hierarchy: physiological needs (food, water, shelter) → safety needs (security, stability) → belonging needs (love, community) → esteem needs (respe…

Mental Model

Master-Apprentice Knowledge Transfer

Some expert knowledge—tacit skills, professional judgment, contextual intuition—cannot be transmitted through documentation or lectures

Mental Model

Mastery Learning (Bloom)

Bloom's model proposes that given sufficient time and instruction, virtually all students can master any objective

Cognitive Move

Match

Compare candidate carriers on capability, constraints, total cost, control relation, and a small pilot instead of grabbing the trendy tool.

Cognitive Move

Match capability

List every candidate carrier, person, tool, or habit, then screen each on raw ability alone: can it do this exact operation at the quality, speed, depth of context, and consistency the work needs? Ignore price, ethics, and preference here.

Cognitive Move

matrix

Two lists crossed, with something in every intersection. Rows are one kind of thing, columns another, and the cell holds whatever happens when the two meet. Because every pair gets a cell, a matrix catches interactions that a table of averages hides, and it also shows the empty cells, which are often the real finding.

Mental Model

Matthew Effect (Rich Get Richer)

Robert Merton's sociological observation (from Matthew 25:29: 'to those who have, more shall be given') that advantage compounds: early success creates conditions for further success, while early disadvantage creates con…

Cognitive Move

maturity scale

A ladder whose rungs are written as what you can do at that level rather than as a grade. Because each rung is a behavior, you place yourself by checking which description is true of you, and the rung above tells you the next thing to practice. Written well, it doubles as a test: if you cannot demonstrate the rung, you are not on it, whatever it felt like.

Mental Model

McNamara Fallacy

Named after Robert McNamara's Vietnam War strategy of measuring success by body counts: the error of making decisions based solely on quantitative metrics while ignoring qualitative factors that are harder to measure but…

Mental Model

Mean

The arithmetic average: sum all values and divide by count