Gervase Markham wrote:

>We could say that MTBF has to be, say, 200
>hours - but we'd just be pulling numbers out of the air.
>
Of course. We can't reach "no crashs at all". We must not crash every 2 
minutes. Everything in between (including the "acceptable" level, as 
percieved by the user) is somewhat arbitary. I.e. we must pull a number 
out of the air. Or go by "feeling", which is even less rational.

My "MTBF 250-500 hours" comes from 'Mozilla should crash at most once a 
month on the average'.


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