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Over the years there has been serious controversy over the
definitions of verification and validation; specifically, software
and system engineers have used different definitions. IEEE standard
610.12 (1990), IEEE Standard Glossary of Software Engineering
Terminology, contains:
- Validation. The process of evaluating a system or component during or at
the end of the development process to determine whether it satisfies
specified requirements.
- Verification. The process of evaluating a system or component to
determine whether the products of a given development phase satisfy the
conditions imposed at the start of that phase.
Note that both these involve only the system's internal documentation rather than actual needs (which may of course differ from the documentation).
However by 2004 I believe the System Engineering definition is winning the battle; thus Verification is closer to the 610.12 definition of validation while Validation depends on actual needs.
> -------------------- Begin Original Message --------------------
>
> Scott Finnie wrote,
>
> "In our projects we informally use the terms validation and verification
> as
> follows:
>
> * Validation is checking with stakeholders (sponsors/users) that th=
e
> requirements as specified meet their needs. It's therefore targetted at
> human acceptance
> * Verification is ensuring that an implemented system is consistent
> with the specified requirements.
>
> This is in line with use I've seen elsewhere, although I don't have any
> formal references or definitions. Would be grateful if anyone could poin=
t
> me to relevant material...
> "
> -------------------- End Original Message --------------------
>
> Hi Scott,
>
> Your usage is consistent with my understanding...
>
> ...verification is checking we built it right, validation is checking we
> built the right thing.
>
>
> The SEI's Capability Maturity Model contains a Maturity Level 3 process
> area for each of Verification and Validation.
>
> The respective purposes of these process areas are specified as...
>
> "The purpose of Verification is to ensure that selected work products mee=
t
> their specified requirements."
>
> "The purpose of Validation is to demonstrate that a product or product
> component fulfills its intended use when placed in its intended
> environment."
>
> (Ref: CMU/SEI-2002-TR-012)
>
> I trust this helps.
>
>
> Best regards,
> Grant Rule
>
> _________________________________________________________________________=
__
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