Test a real change, not just the first screen.
A product journey needs to stay understandable after a buyer revises a choice.
Use a realistic review case
Give the reviewer a task with a reason behind it. For example, compare two footprints, add an option, then return to the smaller arrangement. A specific task reveals whether labels, rules, and the summary explain what happens as choices change.
Watch the recovery
When a selection becomes incompatible, check the explanation and the route back to a valid arrangement. A clear message should tell the customer what changed and what to do next. Review this behavior with the people responsible for the product rules.
Check the final handover
After the reviewer changes direction, read the saved summary. It should contain the current selections and the correct assumptions. Test the same case on a phone so the validation message and next action remain visible at the point they are needed.
One useful question.
Add one change-and-recover task to the acceptance cases for your first release.
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