V&V

Verification is a Quality assurance process that is used to evaluate whether or not a product, service, or system complies with regulations, specifications, or conditions imposed at the start of a development phase. Verification can be in development, scale-up, or production. This is often an internal process. It provides assurance that the product will fit certain quality standard.

Validation is Quality control process of establishing evidence (ie. measuring and testing against the requirements) that a product, service, or system accomplishes its intended requirements. This often involves acceptance of fitness for purpose with end users and other product stakeholders.

It is sometimes said that verification can be expressed by the query "Are you building the thing right?" and validation by "Are you building the right thing?" "Building the right thing" refers back to the user's needs, while "building it right" checks that the specifications be correctly implemented by the system. In some contexts, it is required to have written requirements for both as well as formal procedures or protocols for determining compliance.

Verification : "Are you building the thing right?"
- 설계된 요구사항에 맞게 만들고 있는가?
Validation : "Are you building the right thing?"
- 맞게 설계된 요구사항을 만들고 있는가?