Alien54 writes "This earlier Slash story cited a CNN news report on how the August blackout was preventable. But, as seen in this Security Focus article, things are not so simple. 'In the initial stages, nobody really knew what the root cause was,' says Mike Unum, manager of commercial solutions at GE Energy. 'We test exhaustively, we test with third parties, and we had in excess of three million online operational hours in which nothing had ever exercised that bug,' says Unum. 'I'm not sure that more testing would have revealed that. Unfortunately, that's kind of the nature of software... you may never find the problem. I don't think that's unique to control systems or any particular vendor software.' Which leads to a number of other questions."
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