The Magical Number Seven, Plus or Minus Two

Details

Photo

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Name

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Field

Cognitive psychology

Year

1956

Main topic

Limits of human short-term memory

Key idea

People can hold about 7 (give or take) discrete chunks in working memory at once.

Why it matters

Explains why overloaded menus, giant forms, and 20-option settings pages feel like getting full-court pressed.

Best for

Pruning UI complexity, onboarding flows, and settings architecture.

Difficulty

Medium — old-school academic prose but short.

My take

Read this and you’ll start seeing “magic seven” landmines all over your product — and in your slide decks.

Reading tip

Skim the intro, then focus on the sections with examples of chunking; you can mostly ignore the mathy bits.