The decision
Document the cost basis and attribution assumptions before calculating efficiency. Include known missing costs and avoid presenting a partial figure as total acquisition cost.
Rehearse this before accepting the change
Move a fictional invoice into the next month while leaving the campaign dates unchanged. Confirm the report treats the timing consistently with its stated method.
Use fictional examples and an authorised test environment. Record what happened, the evidence you inspected and any issue that still needs a responsible owner.
Choose a useful measure
Monitor cost per defined outcome alongside coverage of the included cost data.
Agree the definition and baseline with the team doing the work. Review the result over a comparable period and note other changes that could affect it.
Your planning worksheet
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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