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<p>and such an abstraction step is not amenable to formal proof. However, it is possible to <a href="page.php?w=verification_and_validation">validate</a> a specification by proving "challenge" <a href="page.php?w=theorem">theorem</a>s concerning properties that the specification is expected to exhibit. If correct, these theorems reinforce the specifier's understanding of the specification and its relationship with the underlying problem domain. If not, the specification probably needs to be changed to better reflect the domain understanding of those</p><p>
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