Living Fieldbook · Field mission

Assumption testing · Up to 15 min · Works on any public product

List three assumptionsbehind one feature.Test the riskiest.

How to go about it

Pick any feature you can see. Write three things that must be true for it to work, choose the one that would hurt most if wrong, and look for evidence on it.

What counts as evidence

The riskiest assumption and one observation about it.

A good observationThe feature assumes people know their friends are on the app. The invite screen shows no friends found for new accounts.
Take this mission

Opens Living Fieldbook in this browser. No account; your notes stay on your device.

One real observation at a time. What you saw is kept apart from what you think it means.