BEFORE THE CAMPAIGN
Write the evidence into the scope.
Identify the asset list, reporting owner, available records, frequency, dates, exception treatment and final delivery format. Operator-dependent evidence should be explicitly marked rather than promised by default.
Where a response route is part of the plan, specify the form, number or code, the person receiving enquiries and how responses will be counted.
AFTER THE CAMPAIGN
Compare planned with delivered.
Reconcile the approved locations, units and period against the supplied records. Document missing placements, downtime or stock variances and the agreed remedy.
Review source-tagged enquiries and advertiser-provided outcomes separately. Mark missing data as unavailable; do not fill the gaps with invented audience or ROI figures.