The profile · The evidence · Element
The sources
What the profile is built from.
The part
What it is
Buyer interviews, support records, sales call notes, and product usage data. Each sees a different part and none sees all of it.
A profile resting on one source is biased in that source’s direction: support records over-represent problems, sales notes over-represent enthusiasm.
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.