The seams · The cost · Element
The closing cost
What fixing it would take.
The part
What it is
Compared with what it costs to leave. The comparison is what makes the prioritisation defensible rather than aesthetic.
Seams following organisational boundaries cost political capital rather than money, and that should be stated as the cost.
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.