Maintenance · The schedule · Element
The planned work
What is due, when, and how long it takes.
The part
What it is
Duration estimates matter because a window sized on optimism is a window that overruns into production time and gets blamed.
Work should be grouped where possible, since the cost of stopping the asset usually exceeds the cost of the work.
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.