Laws Of Unreliability
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1.Computersareunreliable,buthumansareevenmoreunreliable.
2.Atthesourceofeveryerrorwhichisblamedonthecomputeryouwillfindatleasttwohumanerrors,includingtheerrorofblamingitonthecomputer.
3.Anysystemwhichdependsonhumanreliabilityisunreliable.
4.Undetectableerrorsareinfiniteinvariety,incontrasttodetectableerrors,whichbydefinitionarelimited.
5.Investmentinreliabilitywillincreaseuntilitexceedstheprobablecostoferrors,oruntilsomeoneinsistsongettingsomeusefulworkdone.
6.Theonlydifferencebetweenafoolandacriminalisthatthefoolwillattackasystemunpredictablyandonabroaderfront.
7.Asystemtendstogrowincomplexityinsteadofsimplicity,untiltheresultingunreliabilitybecomesintolerable.
8.Self-checkingsystemstendtohaveacomplexityinproportiontotheirinherentunreliability.
9.Theerror-detectionand-correctioncapabilitiesofanysystemserveasakeytounderstandingthetypesoferrorsitcannothandle.
10.Allrealprogramscontainerrorsuntilprovedotherwisewhichisimpossible.
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