Channel selection · The experiment · Element
The allocation
How much is reserved for the unproven.
The part
What it is
A fixed share rather than whatever is left over, since whatever is left over is nothing in a difficult quarter.
Small is fine. The purpose is discovery rather than scale.
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.