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Cognitive Load Theory

Cognitive Load Theory (Sweller) for interface design. Why working memory limits — about 7 items — break onboarding flows, forms and pricing pages. How to design within cognitive limits.

Primary source

John Sweller, 1988, working from George Miller's Magical Number Seven (1956). Educational psychology, applied widely to interface design.

What it is

Working memory has hard limits — about 7 items, plus or minus 2. Designs that exceed this load — too many fields, too many options, too many simultaneous things to consider — cause people to disengage rather than work harder.

When to use it

Forms. Pricing pages. Navigation. Onboarding screens. Anywhere a user is being asked to process new information and act on it.

How I actually apply it

Most signup forms I audit have 6–12 fields. The fix is rarely 'shorter form' — it's 'fewer simultaneous decisions'. Three fields the user can answer instinctively beat eight fields they have to think about.

Want this applied to your product?

A Leak Audit takes one week and produces a prioritised fix list with every recommendation tied to a named framework — including this one. Fixed price: £1,000.