What to change
The comparison should match the decision being made. Ask the analyst to state the duration, weekday composition and completeness of both windows, then explain any material business differences. A smaller but comparable subset can be more informative than a larger mismatched total. Retain the chosen filters with the report so the next review can reproduce the same comparison rather than unconsciously changing the basis of the conclusion.
A worked example
Illustrative example
Illustrative test: Compare two equal-length periods with similar weekday composition.
How to check the result
The report explains its window selection and any remaining comparability limits.
A mistake to avoid
A visually equal chart width does not prove equal underlying periods.
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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