The calendar · The plan · Element
The reserve
The slots deliberately left open.
The part
What it is
A calendar with no room cannot respond to anything, and something always happens — a launch, a competitor, a question that suddenly matters.
Reserve slots get filled with backlog unless they are defended, which is why they need a stated purpose rather than only a gap.
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 horizon
How far ahead the plan is firm.
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