CHAPTER 5 Software Fault Tolerance
Much has been written about why software is so defect prone and about why the problem of designing and writing software is so intrinsically difficult. Researchers recognize both the essential and accidental difficulties of producing correct software. Essential difficulties arise from the inherent challenge of understanding a complex application and operating environment, and from having to construct a structure comprising an extremely large number of states, with very complex state-transition rules. Further, software is subject to frequent modifications, as new features are added to adapt to changing application needs. In addition, as hardware and operating system platforms change with time, the software has ...
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