3.1 Identifying potential deviation from required behaviour
Assurance objective: Identify potential sources of deviation from required behaviour.
Contextual description: Deviations may occur in any of the element of the RAS architecture (Sensing, Understanding, Deciding, Acting and Infrastructure). The potential deviations, and their impact on the satisfaction of safety requirements must be identified for each of the elements and the RAS as a whole.
There are standard methods of identifying deviations (such as HAZOP) which may be applied to meet this objective. The way in which this objective is demonstrated may be different for different elements of the architecture. There may, for example be common failure modes associated with particular technologies that must be managed for each element, as defined in the following sub-sections.