Different software development methodologies call for different levels of user and stakeholder involvement and feedback; so, external validation can be a discrete or a continuous event.

Successful final external validation occurs when all the stakeholders accept the software product and express that it satisfies their needs.

This article has used the strict or narrow definition of verification.

From a testing perspective: Both verification and validation are related to the concepts of quality and of software quality assurance.

g., how can anyone know if the architecture/design/etc. The output of each software development process stage can also be subject to verification when checked against its input specification (see the definition by CMMI below).

Examples of artifact verification: Software validation checks that the software product satisfies or fits the intended use (high-level checking), i.e., the software meets the user requirements, not as specification artifacts or as needs of those who will operate the software only; but, as the needs of all the stakeholders (such as users, operators, administrators, managers, investors, etc.).

ISVV stands for Independent Software Verification and Validation.

ISVV is targeted at safety-critical software systems and aims to increase the quality of software products, thereby reducing risks and costs through the operational life of the software.Note: Verification begins before Validation and then they run in parallel until the software product is released.It would imply to verify if the specifications are met by running the software but this is not possible (e. Only by reviewing its associated artifacts, someone can conclude if the specifications are met.It is normally the responsibility of software testers as part of the software development lifecycle.In simple terms, software verification is: "Assuming we should build X, does our software achieve its goals without any bugs or gaps?Every time the output of a process correctly implements its input specification, the software product is one step closer to final verification.