Keep the lesson for the next incident
Keep the experiment record
Store the hypothesis, eligibility rules, assignment details, instrument changes, result, exceptions, and decision together. Include a case where the metric and user outcome diverged. Future reviewers need the boundary, not only the headline number.
Improve the test plan
Update the experiment brief with a required exposure audit, predeclared guardrails, or a minimum observation window. Show how the change addresses the observed weakness. Avoid adding a ritual that adds paperwork without improving comparison quality.
Set a design warning
Choose a recurrence signal such as a missing comparison event, a late instrumentation change, or a proxy replacing the intended outcome. Assign an owner to check it during the next experiment review and revisit the practice when the signal appears.
What to carry forward
The learning record should connect the experiment design, result limits, changed planning practice, and recurrence signal. State what the team will repeat, alter, or stop. Keep the lesson tied to the measurement boundary so it does not become an unsupported rule about every product experiment.
Technical background: IDEO design thinking guidance.
Keep the decision with the work.
Use a Work Item in Aglet to record the problem, the evidence you have, and the next decision. Add an owner and priority, then keep updates in the discussion so the next person can follow the reasoning.
Create an account See the product workflow