The calendar · The plan · Element
The horizon
How far ahead the plan is firm.
The part
What it is
Long enough that production and approval have room; short enough that the plan can still answer to what is happening in the market.
The rule for changing a firm slot matters more than the horizon itself. Without one, everything is provisional in practice.
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.
The other elements in the plan
The slots
What is scheduled, and who owns each one.
LearnThe reserve
The slots deliberately left open.
Learn