The mechanism · The earning · Element
The rate
How much is earned.
The part
What it is
Expressed in terms the customer can convert into something meaningful. A rate that requires arithmetic to understand does not influence a decision at the point of purchase.
The effective discount rate should be known internally, since that is what the programme actually costs.
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.