Method · The limits · Element

The alternative

What would be needed to answer it properly.

The part

What it is

An experiment, better instrumentation, or a longer observation period. Stating it converts a limitation into a decision about whether to invest.

Frequently the alternative is cheaper than expected and has simply never been proposed.

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.