Mailers Gen

The list you actually meant to send to.

The first thing agreed is what the file is for. The build is repeatable, because the rules are written rather than remembered. Rather than a percentage, you get the numbers the percentage was made from.

Phone formatting

Rendering numbers in a consistent international form, with the original retained.

Size banding

Grouping organisations into ranges that the underlying evidence can actually support.

Scope agreement

Turning a written requirement into countable criteria, and confirming the size before any records are assembled.

Put the deadline on the table early; it changes what is sensible.