Saying

INVEST

A good user story is Independent, Negotiable, Valuable, Estimable, Small, and Testable.

How to use it. When stories feel hard to start, walk through the six checks. The one that fails tells you what is wrong. Usually the story is too big, too vague, or tied to other work.

How it gets misused. Applied as a gate. INVEST is a quality prompt. Mature teams have stories that fail one or two checks and ship anyway, because the trade-off was deliberate.

Saying YAGNI (You Aren't Gonna Need It) Do not build features you might need someday.

INVEST

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