This performance-based specification conveniently inserts the staging and commissioning battery of tests into your Requests for Proposals when you specify an AV system. These tests are essential for attaining zero-defects AV. Included also is the language that explains that final payment will be withheld until the system is certified by a qualified representative of the vendor. If non-conformances arise, and there are discrepancies with the system test results, the client not only introduces the possibility of a third-party Testing and Verification Services provider, but also funded the corrective action in a way that protects the buyer.