The Subtlety Of These Methods Implies An Important Source Of Unreliability

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... The subtlety of these methods implies an important source of
unreliability; unreliable error recovery. Thus it is important that
system testing pay meticulous attention to fault simulation to
uncover weaknesses in the recovery. Data taken on electronic
switching systems show that failure to recover from simplex faults
is usually a significant source of total outage time....

-- Edwin A. Irland, Assuring Quality and Reliability of Complex Electronic
Systems: Hardware and Software, Proceedings of the IEEE, January 1988

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