The window · The lead time · Element

The shortening

What could be done faster.

The part

What it is

Buying rather than building, partnering rather than hiring, or entering with less than the full requirement.

Each costs more and buys time, which is the right trade when the window is the binding constraint.

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.