MENTAL MODEL · M5506

McLuhan's Tetrad

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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

McLuhan's tetrad, proposed by Marshall and Eric McLuhan, analyzes any medium or technology along four dimensions: what it enhances or amplifies, what it makes obsolete, what it retrieves or restores from the past, and what it reverses into when pushed to an extreme. The four laws form a dialectical loop and hold simultaneously, revealing both faces of a technology and its dynamic evolution rather than a single verdict.

SCAFFOLDING EFFECT

psychology

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- Four-question scan: work through enhancement, obsolescence, retrieval, and reversal for any technology. - Tension check: set the four answers side by side and read the strain among them. - Comparison use: run the tetrad on old and new rivals to expose neglected long-term effects.

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Anchor fast decisions

The McLuhans held that every medium simultaneously amplifies something, discards something, revives something older, and, pushed to its limit, flips into its opposite. Because the four effects operate at once, the tetrad forces a technology's costs and benefits into one frame and exposes the direction of its drift.

MINIMUM ACTION

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Practice this model in one real situation:

Name what the technology enhances or amplifies. 2. Name precisely what the medium renders obsolete. 3. Name what it retrieves from the past. 4. Name what it reverses into at its extreme. 5. Set the four answers side by side and read the tension.

Check to track your progress (stored locally)

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Tetrad_of_media_effectsZH · Explicit
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