← All chapters Chapter 06

Locating the System Level

The method works at every level; the book teaches at one.

Functions and systems form a hierarchy from road traffic down to a component, and the same derivation applies at each. Safety goals and the hazard analysis belong to the base functions; every other function receives a functional safety concept for its own malfunctions. The main body fixes the system level — a supplier's ECU whose malfunctions are its trees' top level events.