The gap

Capability needed minus capability held, per capability and per date.

The part

What it is

A gap only means something against a date. The same shortfall is trivial two years out and critical next quarter.

Expressing it per capability rather than in total is what makes it addressable; a total headcount gap cannot be recruited for.

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.

Capability
Anchors the gap to the same names used in the map and the forecast.
Reference shared type
Shortfall
The size determines whether this is a hiring problem or an organisational design problem.
Number shared type
Gap opens
When the shortfall starts to bite, which is what sets the urgency.
Date shared type