Segmentation · The segments · Element
The size
How many customers and prospects are in it.
The part
What it is
Current customers and addressable prospects are different counts and both matter: a segment where you already have most of the available customers has little room.
Sizing at segment level is what connects this work to the opportunity sizing.
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.