The fallback plan · The alternative · Element
The viability
Whether it would actually work.
The part
What it is
Checked to the extent that is cheap: that the supplier exists, that the reduced scope still meets the commitment.
An unchecked fallback frequently turns out to be unavailable at the moment it 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.