The window · The duration · Element
The remaining
How much of it is left.
The part
What it is
Tracked rather than estimated once, since a window is being consumed while the organisation deliberates.
Deliberation time is window time, which is worth stating explicitly to whoever is deliberating.
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.