Requirements

What the product has to do, worked out by narrating scenarios and testing rough prototypes.

Where it comes from

Activity: Ideation and prototyping. From the 2010 list: Rapid iteration where the vision can change a lot. Workshops with all business teams. Narrating through user scenarios. Sketching and testing functional prototypes.

The spec (to be worked)

Part	What goes here
Inputs	What this artifact is made from
The skill that makes it	The steps an agent or a person follows
Shape	A fixed template the next skill can read
How it's checked	What has to be true before it counts as done
Next	Approved design proposal

This artifact is a skeleton. Fully worked specs come one at a time, and the changelog records each one.