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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum ( )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Xiangping,Wu ( )
Date posted: Thu Sep 16 2:51:17 US/Eastern 1999
Subject: Software Reliability Prediction
I have just bought the book of Reliability Toolkit:Commercial Practices Edition from RAC.I have some questions on the method of software reliability prediction in it.First,in this book,only seven programming languages'expansion ratios are provided.Does anyone could give me the expansion ratios of other programming languages(e.g.VB,VC++,DELPHI,etc.)? The second question is I found when predict a software' initial failure rate by this method,the result is only related to the host processor speed and the programming language used,but have nothing to do with the length of the code.That is,a software has 20,000 lines of code and a software has 200,000 lines of code will has the same failure rate.Does anyone could explain it? Thank you.

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Subject: Software Reliability
Reply Posted by: Birinder Singh ( )R Communications
Date Posted: Thu Nov 11 11:33:48 US/Eastern 1999
the length of the program certainly does have impact on determing its failure rate. thesoftware that we are testing has shown that the estimation that we do based on the sample of failures detected can than be multiplied by two characterstics of the code to determine the remaining failures that are expected to be found. the two charaterctics are : (i) lines of code (ii) complexity factor

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