The fallback plan · The lead time · Element
The total
How long from decision to running.
The part
What it is
The figure that matters, and the one that determines whether the fallback is real.
Where it exceeds the remaining time at every plausible decision point, the fallback does not exist and something else is needed.
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.