Build and verify
Numbers you can plan around.
The starting point is the audience, described plainly enough to measure. Where a rule rejects a row, the reason travels with the rejection. You can tell, from the file alone, what was checked and what was assumed.
Validation
Checking structure and reachability before a file is used, not after.
Count reconciliation
Producing the figure by the same route the final selection takes, so the two cannot disagree.
Size banding
Grouping organisations into ranges that the underlying evidence can actually support.