Re: Orders of Fault Management

[Marin David Condic <nobody@noplace.com>]

Dmitry A. Kazakov wrote:
> On Wed, 28 Jul 2004 12:06:13 GMT, Marin David Condic wrote:
> 
> 
>>Also, a "bug" may not truly stop a software application from 
>>accomplishing its purpose.
> 
> 
> Which is probably not a bug then. (:-))

Kind of a gray area. A common type of bug in the world I live in might 
be one where you fail to detect that an actuator is out of control 
because of a current difference between what you ask for and what you 
get. That is a bug. But sooner or later because of a position feedback, 
you see that the actuator is out of control and take the right 
accommodation. So you have a "bug", but due to redundancy in detection 
techniques, you can still use the software to operate the device safely.

> 
> 
>>In that case, one might debate the economics 
>>of trying to remove "all bugs". It kind of leads to the question "How 
>>good is 'good enough'?"
> 
> 
> Perhaps one should better talk about requirements fulfilling...

See above. You fulfil the important system level requirement, but you 
fail a lower level requirement that might have lesser importance. Do you 
change your mind and say "well, that wasn't really a requirement - I can 
live without that feature for now." Or do you insist the software is 
unacceptable and delay everything until it is fixed? As is often the 
case, the answer is "It Depends..." There is no clear cut right and 
wrong here - you have to look at what the actual situation is and 
determine if you can live with it or not.

MDC


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Marin David Condic
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