The comparison basis

What the premium is measured against.

The part

What it is

An unbranded equivalent, a private label, or a competitor with comparable specification. Each is imperfect and each should be stated.

Specification differences are where this measure is usually contested, so recording them removes most of the argument.

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.

Compared with
What the premium is measured against.
Entity shared type
Specification differences
Where the comparison is not exact, stated openly.
Text shared type
Source
Where the comparison price came from.
Source shared type