Category Definition --------------------------------------------------------------------- A Software that if not executed, or if not correctly executed, or whose anomalous behaviour can cause or contribute to a system failure resulting in: -> Catastrophic consequences --------------------------------------------------------------------- B Software that if not executed, or if not correctly executed, or whose anomalous behaviour can cause or contribute to a system failure resulting in: -> Critical consequences --------------------------------------------------------------------- C Software that if not executed, or if not correctly executed, or whose anomalous behaviour can cause or contribute to a system failure resulting in: -> Major consequences --------------------------------------------------------------------- D Software that if not executed, or if not correctly executed, or whose anomalous behaviour can cause or contribute to a system failure resulting in: -> Minor or Negligible consequences ---------------------------------------------------------------------