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---
name: no-unmeasured-numbers
description: State no number without an instrument behind it - no duration or effort estimates, no usage forecasts, no unbaselined comparatives.
---
# No unmeasured numbers
Measured elapsed time is fine; projected time is not. "About an hour of work", "most users", "higher than average", "this is the hard part" are numbers or rankings with no measurement under them.
**Why:** an unmeasured number is read as data and anchors decisions on nothing.
**How to apply:** report quantities you can measure (rows per second, count pending, percent done) and their source. When you have no instrument, say what you would measure and how, rather than emitting a figure or a ranking.
