This education system (also U- or V-education) was developed in the early 1980s by Dr. med. Alain Carbonneau in the INRA developed in Bordeaux. It consists of a V-shaped or U-shaped support framework that resembles the eponymous Greek musical instrument. The vine trunks are about 80 cm high, the row spacing is at least three meters. The shoots are divided so that two foliage walls with a hollow area in the middle arise (opposite the Spaliereerziehung with only one foliage wall). This results in a doubling of the leaf surface and thus better utilization of solar energy or the Photosynthetic performance, Also the vintage is favored. Disadvantages are the increased effort for the foliage care and the bad suitability for a machine pruning,
It is a kind 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 foliage walls are arranged at different heights. The system developed in Australia Tatura Trellis is very similar. See also Constellations below training system (Systems) and Weingarten Care (Activities).