File preparation
Records with provenance, not records with volume.
Who to leave out is settled at the same moment as who to include. Categories are checked against the underlying description, not the label attached upstream. The result is auditable line by line.
Contact precedence
Choosing which person represents an organisation when several qualify, by a stated rule.
Definition work
Turning a loose brief into something precise enough to count the same way twice.
Match confidence
Separating confident pairs from probable ones, and reporting the latter rather than folding them in silently.