Point 20: People Remember Only Four Items At Once

Urban Legends and Research

• "The magic number 7, plus or minus 2" is a popular phrase from a George Miller research paper referring to how many pieces of information people can process (from 5 to 9). it's also a myth as the research paper was actually a talk Miller gave.
• Further research done by Alan Baddeley and Nelson Cowan shows that the magical number is actually 3 or 4 so long as there aren't any distractions.

Using "Chunks" to Expand Your Memory

• "chunking" information together into groups is a strategy used to help remember more.
• For example: phone numbers!
• 704-333-2443
• instead of having to remember 10 separate numbers; you have 3 "chunks" with 4 or less in each one therefore it is easier to remember.
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• Pie de imagen: Another example of chunking

Magic Number 4 in Memory Retrieval

• Research shows that 4 item rule applies to long-term memory too. George Mandler showed people could memorize information in chunks and remember it if there were one to three items in each one as the number of items increased, the ability to remember decreased.
• 2 Japanese researchers showed that the rule can even apply to chimps!
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• Pie de imagen: information from George Mandler's research

Takeaways

• Limit the information you give people to 4 items
• Group information into chunks for more pieces of information
• Limit each chunk to 4 items