Decision points · The date · Element
The margin
How much slack sits between the decision and the lead time.
The part
What it is
Small but not zero, since deciding at the exact last moment leaves no room for the decision itself to slip.
A week is usually adequate.
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.