Whether it is read · The usage · Element
The opens
How often each artefact is accessed.
The part
What it is
By person and by period, since a report opened once by everybody and a report opened weekly by one person are different situations.
For emailed reports, opens are a weaker signal and are still better than nothing.
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.