If the measurement plan ignores offline outcomes, start by preserving one representative example. It gives the investigation a concrete reference and makes the eventual correction easier to judge.
Find the likely cause
Digital events stop before the business result.
Treat this as an explanation to verify against the actual work. Look at the input, the relevant decision, and the final result together. If the evidence does not support this diagnosis, investigate the mismatch before applying a convenient but unrelated fix.
Make the targeted correction
Create an appropriate reconciliation process for later qualified outcomes.
A measurement plan should connect a business question to an observable action and a decision the team can make.
Check that the repair worked
Check whether recorded leads can be connected to their eventual status.
Repeat the check on the final version that the reader or customer will encounter. An approved draft, a preview, and a published result can differ; the acceptance decision should concern the version people actually use.
Prevent the next related failure
A separate issue to watch for is this: marketing reports contain dozens of metrics but no decisions. Assign each primary metric to a business question and action.
Monitor the useful outcome
Track the coverage and reliability of decision-critical events rather than the total number of tracked events.
Keep a short record of the original symptom, the evidence behind the diagnosis, and the result of the acceptance check. That record makes the solution reusable when the same condition appears again, without assuming that every superficially similar problem has the same cause.
Official reference for the platform or standard discussed: Google Analytics: key events.