What to change
Missing classification should remain visible as an unresolved category rather than vanish from the total. Ask the analyst to compare the input row count and measure total with the output after joining the lookup. Add a deliberate unknown label to a test sample and confirm how it is represented. Assign ownership for reviewing new source values without automatically treating them as errors or inventing a channel to make the table look complete.
A worked example
Illustrative example
Illustrative test: The fixture includes one known source and one unknown source, both contributing to the total.
How to check the result
The report preserves all eligible activity and identifies unresolved classification.
A mistake to avoid
A tidy list of channels is not evidence that no observations were lost.
Your action checklist
Use these checks to prepare a discussion with your team or supplier. Tick a check when you have recorded the decision or evidence, rather than when a feature has simply been promised.
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Further reading
These primary sources provide additional context for the project decisions above.
Related decisions
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