Re: [SystemSafety] Statistical Assessment of SW With Deliberate Unreliability for a SIL requirement

From: Nick Tudor < >
Date: Wed, 21 Jan 2015 13:06:39 +0000


Under Do, not on statistical evidence. The functionality has to be shown that it cannot be activated unintentionally and this is not done through statistical analysis...."the one in a million chance happens 9 times out 10" [Pratchet]

Nick Tudor
Tudor Associates Ltd
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On 21 January 2015 at 12:59, RICQUE Bertrand (SAGEM DEFENSE SECURITE) < bertrand.ricque_at_xxxxxx

> Do you think it violates ARP and DO ?
>
> Bertrand Ricque
> Program Manager
> Optronics and Defence Division
> Sights Program
> Mob : +33 6 87 47 84 64
> Tel : +33 1 58 11 96 82
> Bertrand.ricque_at_xxxxxx >
> -----Original Message-----
> From: systemsafety-bounces_at_xxxxxx > systemsafety-bounces_at_xxxxxx > Bernard Ladkin
> Sent: Wednesday, January 21, 2015 11:30 AM
> To: The System Safety List
> Subject: [SystemSafety] Statistical Assessment of SW With Deliberate
> Unreliability for a SIL requirement
>
> I am working with others on a reformulation of IEC 61508 Part 7 Annex D,
> on the statistical assessment of software presented with black-box
> functionality.
>
> Rainer Faller brought up an interesting example. He has seen SW which is
> proposed to be used in a safety-related application, which has a Safety
> Requirements Specification (SRS) in that application, and which has a
> "Debug/Maintenance" mode, triggered by a specific input sequence known to
> the SW developer of course, but not necessarily to the system developer who
> wishes to use it in the new safety-related application.
>
> Can such SW be presented as "black box" with statistical evidence of its
> fitness for purpose, and accepted for use based on the statistical
> assessment?
>
> I've written a White Paper on the case, RVS White Paper 8, available at
> http://www.rvs.uni-bielefeld.de/publications/WhitePapers/LadkinFallerExample20150101.pdf
>
> PBL
>
> Prof. Peter Bernard Ladkin, Faculty of Technology, University of
> Bielefeld, 33594 Bielefeld, Germany Je suis Charlie
> Tel+msg +49 (0)521 880 7319 www.rvs.uni-bielefeld.de
>
>
>
>
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