Differentiation · The difference statement · Element
The substitution test
The check that a competitor could not credibly say the same thing.
The part
What it is
Run against each named alternative, this test eliminates most first drafts, which is what it is for.
Where a rival could say it but does not, that is a positioning opportunity rather than a difference — and worth recording as such.
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.