# Test before you expand

Lesson 2 of [Vet an AI agency before you sign](https://aiagencies.fyi/academy/vet-an-ai-agency-before-you-sign.md), 12 minutes.

A polished demo on selected inputs is weak evidence. Test the work on your own cases before you widen the project. Set up a controlled test Give the supplier a controlled sample, and get permission to use the data. Agree on a baseline. Agree on a test set that the supplier cannot tune against during…

The rest of this lesson is for learners enrolled in the course. [See how Vet an AI agency before you sign works](https://aiagencies.fyi/academy/vet-an-ai-agency-before-you-sign.md).

Also on the [web page](https://aiagencies.fyi/academy/vet-an-ai-agency-before-you-sign/test-before-you-expand).