The instrument

What is asked, how often, and under what guarantee of anonymity.

The part

What it is

Question wording is the whole measurement. Changing it between rounds makes the comparison meaningless, however slight the change appears.

Anonymity must be real at the reporting level, which sets a minimum group size below which results cannot be published.

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.

Question
Held constant between rounds, because a reworded question is a new measure.
Text shared type
Frequency
Often enough to see movement, rarely enough that answering still means something.
Period shared type
Minimum group size
The threshold below which results are not published, which is what makes anonymity real.
Number shared type