This is precisely the secret of success at China American Petroleum, a "model student" in the Y2K game. CAP has done extremely comprehensive testing, from an audit (identifying all the equipment which could in some way be affected) and initial adjustments to systematic tests on each machine (individually and then in sets) to a full-scale "flow test" under normal operational conditions.
以在石化業中游產業的 Y2K 模範生中美和來說，他們的測試十分完整，先清倉（找出所有可能受汙染的設備）、修改後，再依序進行單元測試、整合測試，及以正常開機狀態運轉的「進水測試」。