Segment differences · The segments · Element
The reachability
How the group is actually reached for research.
The part
What it is
Customers are easy and non-customers are expensive, which is why the sample is usually weighted towards the group with the least to tell you.
Recording the method makes the resulting bias visible rather than embedded.
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.