From: Ken Garlington <GarlingtonKE@lmtas.lmco.com>
Subject: Re: Ariane-5: can you clarify? (Re: Please do not start a
Date: 1997/03/21
Date: 1997-03-21T00:00:00+00:00 [thread overview]
Message-ID: <3332BA72.72F8@lmtas.lmco.com> (raw)
In-Reply-To: 97031917192223@psavax.pwfl.com
Marin David Condic, 561.796.8997, M/S 731-93 wrote:
>
> I've heard of projects where they design two different computers
> and two different sets of software deliberately to be dissimilar
> so that the problem of a common design flaw is avoided. (I imagine
> that thi$ $ort of $tuff gets *real $pendy!) But then,
> one can always object that they are both operating to the same set
> of requirements and if a requirement is bad, both will do the
> same, wrong thing and fail.
Not only can they object, there is a significant amount of experimental
and anecdotal evidence that says the error will be in the requirements.
See, for example, the work of Levison and Knight.
Ariane-5 is a perfect example of this. As the final report says, the
specification did not contain the Ariane V flight profile as a
requirement.
Given that, I would not be at all surprised if the same design fault
occured in multiple design variants.
> Nothing built by the hand of man is
> without flaws. Guess we just gotta learn to live with an
> occasional failure, 'cause they're gonna happen!
>
> MDC
>
> Marin David Condic, Senior Computer Engineer ATT: 561.796.8997
> M/S 731-96 Technet: 796.8997
> Pratt & Whitney, GESP Fax: 561.796.4669
> P.O. Box 109600 Internet: CONDICMA@PWFL.COM
> West Palm Beach, FL 33410-9600 Internet: CONDIC@FLINET.COM
> ===============================================================================
> In Vegas, I got into a long argument with the man at the
> roulette wheel over what I considered to be an odd number.
>
> -- Steven Wright
> ===============================================================================
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next prev parent reply other threads:[~1997-03-21 0:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-03-19 0:00 Ariane-5: can you clarify? (Re: Please do not start a Marin David Condic, 561.796.8997, M/S 731-93
1997-03-20 0:00 ` Jon S Anthony
1997-03-21 0:00 ` Ken Garlington [this message]
1997-03-25 0:00 ` Requirements failure (was Re: Ariane-5: can you clarify?) Robert I. Eachus
-- strict thread matches above, loose matches on Subject: below --
1997-03-26 0:00 Ariane-5: can you clarify? (Re: Please do not start a Marin David Condic, 561.796.8997, M/S 731-93
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