Validating windows software
For example, the software will evaluate a plan to add a switch or alter LUN masking, apply simulation to determine the impact of that change, identify steps required in the proper sequence to avoid problems, and severity measurements systems only by expert judgment (of measurement methods or in comparison to expected outcomes), people have turned to correlating severity scores with probability of death after treatment.
In software project management, software testing, and software engineering, verification and validation (V&V) is the process of checking that a software system meets specifications and that it fulfills its intended purpose.
Examples of artifact verification: Validation during the software development process can be seen as a form of User Requirements Specification validation; and, that at the end of the development process is equivalent to Internal and/or External Software validation.
Verification, from CMMI's point of view, is evidently of the artifact kind.
Every time the output of a process correctly implements its input specification, the software product is one step closer to final verification.
If the output of a process is incorrect, the developers are not building the product the stakeholders want correctly.
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).
Building the product right implies the use of the Requirements Specification as input for the next phase of the development process, the design process, the output of which is the Design Specification.
Then, it also implies the use of the Design Specification to feed the construction process.
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.