The order that makes a number defensible
Measurement is not something you do at the end of a project. It is the first hour of work, and it runs in a fixed order. First, agree the definition. What exactly is being counted, in what unit, with what inclusion rule. "Quality improved" means nothing. "The proportion of campaigns passing pre-launch QA on first submission, measured monthly across the full book" means something, because two people reading it will count the same thing. Second, fix the baseline. Pull the last three to six months of actuals before anyone touches the process. If the data does not exist, say so in writing and build the measure first; a baseline reconstructed after the fact is a negotiation, not a number. Third, name an owner. One person, by name, accountable for the number every month. Metrics owned by a department are owned by nobody. Fourth, decide what does not count. This is the step most engagements skip and the one that decides whether the final figure survives scrutiny. Are re-opened tickets counted twice. Do cancelled items leave the denominator. Does a fix applied within the same day count as a miss. Write the exclusions down at the start, because at the end everyone has an incentive to remember them differently. Fifth, get client sign-off on the definition, not just the result. Someone on the client side, usually finance or the process owner, signs that this is the right way to count. Then the number is theirs as much as mine, and it holds up in a board pack.