The fallback plan · The trigger · Element
The condition
What has to be true.
The part
What it is
Stated so that two people would agree it had happened. “Milestone three not reached by the fifteenth” rather than “if it looks like it is slipping”.
Tied to something already being measured wherever possible.
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.