The bias

How each source skews.

The part

What it is

Support over-represents problems; reviews over-represent extremes; sales conversations over-represent enthusiasm. Knowing the direction makes each usable.

Read together the biases partially offset, which is a further argument for one view.

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.