Pattern Libraries
Writing Effective Documentation
Documenting the "why" so teams apply patterns correctly in new situations
Key Insight
Good pattern documentation explains not just what a pattern looks like, but when to use it, when not to use it, and why it was designed the way it was. Teams that understand the reasoning can apply patterns correctly in new situations. Teams that only see specs make mistakes when edge cases arise.
Key Points
- •Always explain "why" — not just specifications
- •Include explicit "when not to use" guidance to prevent misapplication
- •Use real production examples, not just controlled demos
- •Do/don't examples prevent the most common misuse patterns
- •Status labels (draft/stable/deprecated) help teams decide what to use in production
Guidelines
- ✓Write for the designer who has never seen this pattern before
- ✓Document the reasoning behind non-obvious design decisions
- ✓Include at least one real screenshot from production
- ✓Keep documentation close to code so it stays in sync
- ✓Review documentation accuracy quarterly — stale docs are worse than none
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