Forecasting · The scenario set · Element
The scenarios
Each alternative path, described by what is different about the world.
The part
What it is
Two or three is enough. More produces a set nobody uses and a false impression of coverage.
Each should be internally coherent — a world where several things are true together, rather than one variable moved.
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.