Picking campaign concepts on how good they sound and discovering their volume afterwards is how a quarter's plan collapses in week three.
Contactable, not addressable
The gap between the two is large and consistent. Companies without a findable decision maker, people without a deliverable address, accounts already in another campaign, customers, competitors, anyone suppressed. Each removes a slice, and the chain is applied in the open so you can see which assumption is doing the damage.
A concept that looks strong at the raw number and weak after the chain is not a bad concept. It is a concept that needs a different channel or a wider geography, and knowing that before you write the copy is the point.
Months, not counts
A segment of four thousand means nothing until you divide it by what you can send. Against a small fleet it is most of a year of work; against a large one it is three weeks and then the campaign starves. The sizing returns the division rather than leaving it to be done later, badly, in a meeting.
When the numbers disagree
The planning stage estimates market size in rough bands. This measures it. When the measurement comes back far above the estimate the usual cause is not a pleasant surprise but a definition that has quietly loosened, and it is flagged as that rather than reported as upside.
Runs well with
Skills compound. These are the ones we usually install alongside it.