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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

Ecological Succession

Ecological succession is change in the composition of an ecological community over time, often examined after disturbance or the opening of space

Mental Model

Ecological Succession as Life Metaphor

Ecological succession—the process by which ecosystems develop from bare ground (primary succession) or disturbed states (secondary succession) through predictable stages toward mature, complex communities—provides a powe…

Cognitive Move

Ecology

Recast the problem as living populations competing and cooperating inside an environment with limited resources. You stop asking what a thing is and start asking which niches exist, what feeds what, what crowds something out, and what conditions let a species take hold.

Mental Model

Economies of Scale

Economies of scale mean declining long-run average cost as output expands under the relevant production and input conditions

Mental Model

Ecosystem

An ecosystem comprises organisms and their physical environment considered through their interactions and exchanges

Mental Model

Edge of Chaos (Optimal Complexity Zone)

The concept from complexity science that the most adaptive, creative, and innovative systems operate at the boundary between rigid order and complete disorder—the 'edge of chaos.' Too much order (rigid hierarchy, strict…

Cognitive Move

Edges

Map the connections around the work: what has to arrive before it can start, who receives the output and in what form, what kicks it off, what it depends on, and where the worker sends anything that does not fit the normal path.

Cognitive Move

Edit, Exit, and Review

Precommit when the goal gets reviewed, revised, rolled back, or abandoned, and by whom.

Mental Model

Effective Altruism

Effective altruism uses evidence and reasoning to seek better ways to help others and act on them

Cognitive Move

Effective?

A three-question check a person can remember after remapping: Same facts? Better move? Worth it?

Mental Model

Efficient-Market Hypothesis

The efficient-market hypothesis concerns how asset prices reflect a specified information set and whether that information permits systematic abnormal returns under an appropriate return model

Mental Model

Ego Depletion

The (debated but practically useful) model that self-control draws from a limited resource that gets depleted through use—like a muscle that fatigues

Mental Model

Ego Development Theory (Loevinger)

Jane Loevinger's ego development theory describes a sequence of increasingly complex stages of meaning-making, self-awareness, and interpersonal understanding

Mental Model

Eisenhower Matrix (Eisenhower Box)

A task-prioritization heuristic separating urgency from importance, commonly associated with Eisenhower's quoted distinction and later time-management frameworks.

Mental Model

Eisenhower Matrix Action Protocol

A daily prioritization protocol that classifies every task into one of four quadrants based on urgency and importance, then prescribes a specific action for each quadrant

Mental Model

Elaborative Interrogation

A learning technique where you ask 'why is this true?' and 'how does this connect to what I already know?' for each new piece of information

Mental Model

Elder Council Governance

Elder council governance, practiced across African, Indigenous American, Pacific Island, and Aboriginal Australian societies, vests primary decision-making authority in councils of elders chosen for their accumulated wis…

Mental Model

Elderhood as Developmental Stage

Bill Thomas and other gerontologists argue that elderhood (roughly 75+) is a distinct developmental stage — not merely 'late adulthood' but a qualitatively different period with its own developmental tasks, gifts, and ch…

Mental Model

Electoral vs. Non-Electoral Civic Action

This framework distinguishes electoral action (voting, campaigning, running for office) from non-electoral action (organizing, litigation, direct action, boycotts, cultural production, mutual aid)