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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: newbie, Spark 2014 or Ada 2012
Date: Thu, 09 Jul 2015 13:41:49 -0700
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> writes:
> In simple terms: all programs need to be correct, robust, and reliable.

But they also have to ship on time, and that's often of higher priority ;-).

Here's a famous and somewhat relevant study:

http://web.cecs.pdx.edu/~apt/cs457_2005/hudak-jones.pdf