Closing the loop · The response rate · Element

The rate

What proportion answer.

The part

What it is

Tracked over enough periods to see a trend rather than a fluctuation.

By segment where possible, since a fall concentrated in one group is a different finding from a general one.

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.