However, it is also possible to perform internal static tests to find out if it meets the requirements specification but that falls into the scope of static verification because the software is not running.Not only the software product as a whole can be validated.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.).There are two ways to perform software validation: internal and external.Requirements should be validated before the software product as whole is ready (the waterfall development process requires them to be perfectly defined before design starts; but, iterative development processes do not require this to be so and allow their continual improvement).Examples of artifact validation: 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.
However, often for non-mission-critical software systems, formal methods prove to be very costly A test case is a tool used in the process.
External validation happens when it is performed by asking the stakeholders if the software meets their needs.
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.
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.
By themselves, verification and validation do not guarantee software quality; planning, traceability, configuration management and other aspects of software engineering are required.