The relationship

How each supporting message relates to the master message.

The part

What it is

Making the relationship explicit is what prevents a supporting message quietly becoming the main one because it performs better.

A supporting message consistently outperforming the master one is a finding about the position rather than about the messaging.

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.

Relationship
Evidences, answers an objection, or extends.
Choice shared type
Relative performance
How it performs against the master message.
Measure shared type
Promotion candidate
Whether it is consistently outperforming and should be reconsidered.
Choice shared type