Miller's Law and the Chunking Mechanism

In 1956, cognitive psychologist George A. Miller published The Magical Number Seven, Plus or Minus Two, demonstrating that human short-term working memory can hold approximately $7 \pm 2$ discrete chunks of information simultaneously.

In digital design, Miller's Law does not mean interfaces must always feature 7 items. Rather, it mandates chunking: organizing complex data into digestible, semantically coherent clusters:

• Credit Card Inputs: Grouping 16 uninterrupted digits into 4 chunks of 4 (4532 •••• •••• 8912) drastically reduces transcription errors.
• Phone Numbers: Formatting +14155552671 as +1 (415) 555-2671.
• Navigation Architecture: Structuring 24 subcategories under 4 distinct, clearly labeled mega-menu headers.