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Date: Tue, 22 Jul 2003 15:06:34 -0400
From: Hyman Rosen <hyrosen@mail.com>
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Subject: Re: Ariane5 FAQ
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Date: 2003-07-22T15:06:34-04:00
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Tarjei T. Jensen wrote:
> What you are want is for random software to work
 > the same in two different system.

They didn't just move the software, they moved the hardware too.
I don't "want" anything. The investigatory report says that the
Ariane 4 SRI software and documentation failed to make obviously
clear its dependence on the details of the Ariane 4 flight path,
which helped lead to the assumption by the Ariane 5 people that
it would "just work". The failure to check for overflow in the
Ariane 4 code was not an essential part of its operation, but a
shortcut taken in order to reduce CPU usage. Software which has
such sensitive dependency on input is brittle and fragile, and
should accordingly come plastered with warning stickers.