The window · The lead time · Element
The requirement
What has to be in place to enter.
The part
What it is
Product, capability, distribution, credibility and permission. Each has its own lead time and they are not all parallel.
The longest one sets the total, and it is frequently credibility rather than product.
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.