The direct cost

What changing it would cost to execute.

The part

What it is

Material rewritten, people re-briefed, external carriers re-equipped, and the internal effort of getting everyone onto the new version.

The internal effort is the part consistently underestimated.

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.

Direct cost
What execution would cost.
Money shared type
Internal effort
Time required to move everyone onto the new version.
Duration shared type
Surfaces affected
How much material would need changing.
Number shared type