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Verification and validation are independent procedures that are used together to confirm that a product, service, or system meets requirements and specifications and is fit for its purpose. These are important components of a quality management system such as ISO 9000. The words “verification” and “validation” are sometimes preceded by “independent,” which indicates that verification and validation should be performed by an uninterested third party. “Independent verification and validation” may be abbreviated as “IV&V”.

In practice, as the terms of quality management, the definitions of verification and validation may be incompatible. They are sometimes even used interchangeably.

However, the PMBOK guidelines, a standard adopted by the Institute of Electrical and Electronic Engineers (IEEE), defines them as follows in its fourth edition.

“Validation, Ensuring that a product, service, or system meets the needs of the customer and other identified interested stakeholders. This often includes acceptance and compliance with external clients. Unlike Verification.”

Verification aims to ensure that a product, service, or system conforms to a set of design specifications. At the development stage, verification procedures include performing specific tests to simulate or model part or all of a product, service, or system, followed by reviewing or analyzing the simulation results. During the post-development phase, verification procedures include regular, repeatable tests specifically designed to ensure that a product, service, or system continues to meet its original design requirements, specifications, and regulations over time. It is a process used to assess whether a product, service, or system meets the conditions, specifications, or conditions established at the beginning of the development phase. Inspection can be in development, scale-up, or in production. This is often an internal process.

Validation is intended to ensure that a product, service, or system (or part thereof, or set thereof) results in a product, service, or system (or part or set) that satisfies the user’s operational needs. For new development or verification flow, validation procedures may involve modeling the flow or using simulations to predict faults or gaps that could lead to invalid or incomplete Verification or product development, service, or system (or their part, or their set)). A set of validation requirements (as defined by the user), specifications, and rules can then be used as a basis for defining the development flow or verification of a product, service, or system (or part of it).

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