Known Good Beats Good Guessing
Use known-good and known-bad states to plan the next isolation test.
A symptom without a comparison is just a claim. Known-good troubleshooting starts by naming two endpoints: one state where the thing works and one state where it fails. The comparison does not have to be perfect. It has to be similar enough that a difference teaches you something. Anchor the failure Write the failing case in concrete terms: user, device, place, time, workflow, exact result. Then write the nearest working case. The more similar the working case, the more useful the split. Test the boundary Swap one side of the comparison. Same user, different device. Same file, different account. Same…
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