Re: [SystemSafety] Autonomous Vehicles and "Hacking" Threats

From: Stefan Winter < >
Date: Thu, 27 Nov 2014 12:06:32 +0100

On 11/23/2014 11:01 AM, Peter Bernard Ladkin wrote:
> On 2014-11-21 17:38 , Stefan Winter wrote:
>> ......
>> I had hoped for some better estimate of defect densities ...... The best approximation I
>> had come up with so far is the product of "lines of code in a modern car" (100 million for a premium
>> car in 2009) and "defect count per line of code in really critical software" (10^-4).....
>> If anyone has a better idea or wants to share more accurate numbers, please let me know.
> Is your interest strictly automotive, or in gathering information from various sectors? Assuming
> it's the latter, here is some more info.

My interest is mostly, but not strictly, automotive. The references I have received from you and Martyn Thomas along with Dewi Daniels's comments are very helpful to put any estimate for (automotive) software defect rates in context. I agree that one should be careful drawing conclusions from defect density comparisons, as the measured densities may vary significantly with varying measurement processes and defect notions.

Thanks for your input!

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systemsafety_at_xxxxxx Received on Thu Nov 27 2014 - 12:10:28 CET

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