The window · The duration · Element
The closers
What would close it.
The part
What it is
A competitor entering, the enabling condition being matched, or demand being satisfied by an existing player.
Each is watchable, which turns the duration estimate into something monitorable rather than a guess.
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.