FAR 9.303

Use.

Testing and approval may be appropriate when- (a) The contractor has not previously furnished the product to the Government; (b) The contractor previously furnished the product to the Government, but- (1) There have been subsequent changes in processes or specifications; (2) Production has been discontinued for an extended period of time; or (3) The product acquired under a previous contract developed a problem during its life; (c) The product is described by a performance specification; or (d) It is essential to have an approved first article to serve as a manufacturing standard.

Source: acquisition.gov — FAR

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