Reuse and lifespan · The lifespan classification · Element
The class
Which kind of lifespan the piece has.
The part
What it is
Evergreen work stays useful until the subject changes. Seasonal work returns. Topical work is spent on publication and should be costed as such.
The class is assigned at commissioning and checked afterwards, because the two disagree more often than anyone expects.
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 lifespan classification
The observed life
How long the piece actually stayed in use.
LearnThe spend rule
What each class is worth spending.
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