Verifying and validating
Determining the degree of M&S accuracy is required because all M&S are approximations of reality, and it is usually critical to determine if the degree of approximation is acceptable for the intended use(s). In mission-critical software systems, where flawless performance is absolutely necessary, formal methods may be used to ensure the correct operation of a system. 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.
Building the right product implies creating a Requirements Specification that contains the needs and goals of the stakeholders of the software product.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.There are two ways to perform software validation: internal and external.During internal software validation, it is assumed that the goals of the stakeholders were correctly understood and that they were expressed in the requirement artifacts precisely and comprehensively.
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If the software meets the requirement specification, it has been internally validated.