You Can Only Hold About 7 Items in Working Memory
Miller's Law explains why we struggle to remember long lists and phone numbers.
The Magic Number Seven
In 1956, psychologist George Miller published his famous paper about the limits of human working memory. We can typically hold 7±2 items in our short-term memory at once.
Why This Matters
This limitation affects everything:
- Phone numbers (why [they're](/post/placebo-effect-awareness) broken into chunks)
- Shopping lists
- Learning new information
- Multitasking ability
Chunking Strategy
Your brain can overcome this limit through "chunking"—grouping information into meaningful units. Instead of remembering 10 individual digits, you might remember a phone number as three chunks.
Modern Implications
This is why user interfaces work best with limited options, and why information is most digestible when broken into small pieces.
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Frequently Asked Questions
Individual working memory capacity varies. Some people can hold 5 items, others 9. The average is 7, which is why Miller called it '7 plus or minus 2.'
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