Stephen wrote:
> I meant that they don't often get updated because the programmers got
> it right first time. Maybe I should mention that I'm not thinking
> about pc based systems.

That too. Of course, when what you want changes, you have to balance the 
cost of making that change and being assured of getting it right against 
the value you get from making the change. Which is what I was saying. :-)

I don't think the shuttle programs are such that this month's flight 
being successful means they don't have to change the software for next 
month's flight, for example.

-- 
   Darren New / San Diego, CA, USA (PST)
     "That's pretty. Where's that?"
          "It's the Age of Channelwood."
     "We should go there on vacation some time."

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