Consequently, the well-known procedures for validating chemical tests are not appropriate for many microbiological tests.
A set of validation requirements (as defined by the user), specifications, and regulations may then be used as a basis for qualifying a development flow or verification flow for a product, service, or system (or portion thereof, or set thereof).This may happen because when a product or application is build as per the specification but these specifications are not up to the mark hence they fail to address the user requirements.Validation is basically done by the testers during the testing. Incidents can also be of type ‘Question’ where the functionality is not clear to the tester.The words "verification" and "validation" are sometimes preceded with "independent", indicating that the verification and validation is to be performed by a disinterested third party. The PMBOK guide, a standard adopted by IEEE, defines them as follows in its 4th edition: In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service or system, then performing a review or analysis of the modeling results."Independent verification and validation" can be abbreviated as "IV&V". In the post-development phase, verification procedures involve regularly repeating tests devised specifically to ensure that the product, service, or system continues to meet the initial design requirements, specifications, and regulations as time progresses.