What to change
Treat collection coverage as part of the comparison context. Ask the measurement owner to identify what changed and which observations may now be absent or treated differently. Keep the change in the report notes and compare independent operational evidence where appropriate. Do not invent a multiplier to restore the earlier total. The practice needs an honest explanation of what the current measurement can support before deciding that a campaign or website has deteriorated.
A worked example
Illustrative example
Illustrative test: A fictional report marks a measurement break instead of joining the periods as fully equivalent.
How to check the result
The narrative distinguishes changed observation from established behavioural change.
A mistake to avoid
A collection change is not evidence that unobserved activity disappeared.
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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