Sizing · The build-up · Element
The count
How many potential customers there are.
The part
What it is
Counted from something observable — a register, an industry list, a population statistic — rather than estimated as a share.
The definition of who counts is where most of the error is: a count of all organisations in a sector is not a count of those who could buy.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.