In his book "Arborist Equipment" Donald Blair has an authors note suggesting that he was or is certified through Yale Cordage. The test seems to be to splice a rope and have it broken in their lab. Should the rope fail before the splice your certified. It's on page 173 of my copy. I splice 16 and 3 strand for my company and I have performed this test using heavy equipment. Not for certification, but rather for my comfort and that of my co-workers.