Specification drafting
Sized before it is built.
The brief is the specification, and it is written before the build. Anything inherited from a source is tested rather than assumed. Each delivery says how old its parts are.
Feasibility counts
How many records meet your criteria, with the criteria written out so the number can be checked.
Catch-all detection
Separating addresses that are confirmed from addresses on a domain that accepts anything.
Completeness testing
Checking which columns are populated and to what degree, before handover rather than after it.