This educational system (also U- or V-education) was developed in the early 1980s by Dr. Alain Carbonneau in the INRA developed in Bordeaux. It consists of a support structure that opens upwards in a V or U shape and is similar to the eponymous Greek musical instrument. The vine stems are about 80 cm high, the row spacing is at least three meters. The shoots are divided so that two leaf walls are created with a hollow area in the middle (opposite the Spaliereerziehung with only one leaf wall). This results in a doubling of the leaf surface and thus better use of solar energy or Photosynthetic performance, Also the vintage is favored. Disadvantages are the increased effort for the foliage care and the poor suitability for a machine pruning,
It is a variety of Geneva Double Curtain, in contrast, the shoots are directed upwards. In the United States there are different variants such as the "Asymmetric Lyra", in which the two leaf walls are arranged at different heights. The system developed in Australia Tatura trellis is very similar. See also lists below training system (Systems) and Weingarten Care (Activities).