Segmentation · The basis · Element
The data availability
Whether the organisation can actually tell which segment a customer is in.
The part
What it is
A basis that predicts perfectly and cannot be observed in the customer record cannot be used operationally.
This is where behavioural segmentation frequently fails in practice, and the answer is usually a small instrumentation change rather than a different basis.
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.