Channel selection · The fit · Element
The audience presence
Whether the target segment is actually here.
The part
What it is
Drawn from the audience work rather than from the channel’s own audience claims, which describe their whole user base.
The relevant figure is what share of the channel’s audience is your segment, not what share of your segment is on the channel.
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.