Early and late · The late cost · Element

The incumbent

What is already established.

The part

What it is

Who holds the position, how strongly, and what would make a customer switch.

A weakly held position is a very different proposition from an entrenched one, and the difference is knowable.

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.