This document describes default way of dealing with hypothesis in a Async way.
Create page in BAU explaining what is the hypothesis you are going to work around.
Design smallest possible experiment to be run today/this week. Include that in BAU.
Run experiment and document the result.
Document results of the experiment by creating page in Lesson learned that is connected to the BAU with hypothesis
Update the status of BAU, include changelog update with short message what has changed and what are next steps - how the results from the experiment prove or discard the hypothesis.
If you need more information, design another experiment and repeat the process.