The fallback plan · The alternative · Element
The cost
What the alternative gives up.
The part
What it is
Named honestly. A fallback presented as costless is not a fallback, it is the plan that should have been chosen.
Usually scope, quality or margin, and knowing which lets the decision be made properly.
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.