1. Highlighting possible malfunctions of the systems, that even
without causing accident, can give raise to a loss of product
quality or to the process-plant shutdown.
2. Outlining top-events that are undesired situations, often the
potentials of release of hazardous substances to the environment,
to be included in the QRA.
3. Describing potential scenarios associated with the top-events
and their consequences. Based on the type of process upset
and the performance of control and safety barriers, the scenario
could involve quality loss, safety loss, or both