This article has used the strict or narrow definition of verification.
From testing perspective: Both verification and validation are related to the concepts of quality and of software quality assurance.
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?
Test cases may be prepared for software verification and software validation to determine if the product was built according to the requirements of the user.
Other methods, such as reviews, may be used early in the life cycle to provide for software validation.
" On the other hand, software validation is: "Was X what we should have built? " Building the right product implies creating a Requirements Specification that contains the needs and goals of the stakeholders of the software product.
If such artifact is incomplete or wrong, the developers will not be able to build the product the stakeholders want.
Every time the output of a process correctly implements its input specification, the software product is one step closer to final verification.Software verification ensures that "you built it right" and confirms that the product, as provided, fulfills the plans of the developers.Software validation ensures that "you built the right thing" and confirms that the product, as provided, fulfills the intended use and goals of the stakeholders.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.