Intra-system inconsistency
This term refers to exceptional machine state, irrelevant to a particular stage in a particular operational procedure. The inconsistency is between the machine's units, as was the case with the Therac 25 accidents (Casey, 1998),
Inter-system inconsistency
This term refers to exceptional context, not mentioned in the system requirement specification document. The i nconsistency is between two sub systems, as was the case with the friendly-fire accident in Afghanistan, 2001 (Casey, 2006).
Updated on 20 Mar 2016.