[SystemSafety] Data on Proof effectiveness from real projects

[paul_e.bennett at topmail.co.uk]

On 02/04/2016 at 6:38 AM, "Steve Tockey" <Steve.Tockey at construx.com> wrote:
>
>Bev wrote:
>
>"This is indeed interesting. But what was the the definition of 
>“efficiency of fault detection” here? Finding the most faults for 
>a given outlay of effort? Maximising the chance of finding all 
>faults? I can imagine other definitions."
>
>Generally speaking, efficiency is looking at investment per unit 
>of work done. In other words, increasing efficiency means that the 
>same work is done at lower investment—the same (number of?) 
>defects are found for a lower investment. Maximizing the chance of 
>finding defects would be an issue of effectiveness. Effectiveness 
>is looking at the rate at which the job is done correctly (I.e., a 
>defect is found, not missed). One needs to look at both efficiency 
>and effectiveness of processes to make a fair comparison.

When the largest proportion (44%) of the defects occur within the
specification phase it should be obvious where defect removal should
be most concentrated.

Regards

Paul E. Bennett IEng MIET
Systems Engineer

-- 
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Paul E. Bennett IEng MIET.....<email://Paul_E.Bennett@topmail.co.uk>
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