V- model means Verification and Validation model. It is a widely accepted reference model for computer system validation and was introduced by International Society of Pharmaceutical Engineers (ISPE) in 1994 in the first edition of their Good Automated Manufacturing Practices guideline, (gAMP).
It is called the
V-model because of it’s characteristic “V” shape. The
left arm of the “V” represents the planning / specification phases such as User
Requirements Specification, Functional Specification, Detailed Design, and the
right arm of the “V” represents the execution-validation phases such as
Installation Qualification (IQ), Operational Qualification (OQ) and Performance
Qualification (PQ) and both the arms converge at the Build and Unit Testing
phases at the V-Point.
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The V-model
provides a logical sequence that helps to organize the complex activities of
defining a project scope, executing it, and qualifying it.
The V model
provides an excellent basis for design control and tracking design changes
through the proceeding of the project.