The seams · The cost · Element
The consequence
What happens when they hit it.
The part
What it is
A support contact, a delay, an abandonment or a departure. The cost differs by an order of magnitude between them.
The consequence is measurable from what customers do next.
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.