Design decisions · The rationale · Element
The evidence
What the decision rests on.
The part
What it is
Observation, a test result, an established pattern, or judgement. Only the first two constrain a later change.
A decision made on judgement should say so, since it is then reasonable for a later judgement to differ.
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.