Sizing · The three sizes · Element
The serviceable
The part the organisation could actually reach and serve.
The part
What it is
Constrained by geography, channel, regulation, language and what the offer actually does. Each constraint removes a share and each should be named.
This is usually a small fraction of the total and the reduction is where the useful thinking happens.
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.