Decision points · The date · Element
The calculation
How the date is derived.
The part
What it is
Commitment date minus lead time minus margin. Three numbers, one of which is already known.
Where the result is in the past, the fallback was never available and this is worth knowing at the start.
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.