Measuring perception · The reading · Element
The response rate
How many of those approached actually answered.
The part
What it is
A falling rate means the sample is increasingly composed of people willing to answer surveys, which is a specific and unrepresentative group.
Reporting it alongside every figure is what keeps the results honest.
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.