The cycle · The collisions · Element
The cost
What the collision actually costs.
The part
What it is
Usually one of the two done badly rather than both done well. Which one gives way is worth knowing, since it is consistent.
The demand peak generally wins and the internal obligation is done at the last moment, which is where errors come from.
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.