A beginning of the 1960er-Jahre from the American Weinbaufachmann Dr. Nelson Shaulis (1913-2000) at the Cornell University (Geneva, New York State) developed educational system (double-curtain education). It belongs to the large group of so-called Spurred cordon systems, Originally it was specially for the grape variety Concord created a machine vintage to enable. The vines are pulled onto a high T-shaped scaffold (also V-shaped). The vine line distance is about three meters. The young shoots divide left and right, directing the foliage onto two fold-down wire frames.
By folding down the plant grows down, whereby the growth power is inhibited and the incidence of light is improved. The system has in the United States and Australia acquired only a minor importance; It has not worked well in Europe. One variant is the California-developed duplex education , which allows a largely mechanical harvest. Only the grape-bearing fruit shoots (not the foliage shoots) are attached to a wire. The developed in France Lyra education is also similar, but in this the shoots are directed upward. See also below training system (Systems) and Weingarten Care (Activities).