Verification and Validation.

Verification and Validation is independent procedures that are used together for checking that a product, service, or system meets requirements and specifications and that it fulfills its intended purpose.

 

Verification:

• Verification is the process of checking or testing items, including software, for conformance and consistency by evaluating the results against pre-specified requirements.
• Verification: "Are we building the product right"
• The software should conform to its specification.
• It is intended to check that a product service, or system meets a set of initial design requirements, specifications, and regulations.

Validation:

• Validation looks at the system correctness – i.e. is the process of checking that what has been specified is what the user actually wanted.
• Validation: “Are we building the right product?”
• The software should do what the user really requires.
• It is intended to check that development and verification procedures for a product, service, or system result in a product, service, or system that meets initial requirements, specifications, and regulations.