Now, for the riskiest assumption, pull it into the "Test Plan" column and fill out a test card. In each Assumption ticket there's a table so you can add as many test cards as you like.
Now return to your assumptions backlog, and make those Test Cards! Or check out the references below if you need a bit more background.
Our framework is based on the excellent test cards and learning cards created by Strategyzer.
Stategyzer offers a variety of potential tests in their book *Testing Business Ideas.*