Presented by Jeroen Groot, Charlotte Klapwijk, Carl Timler, Mateete Bekunda, Tom van Mourik, Katrien Descheemaeker, Pablo Tittonell, Ken Giller, Sieglinde Snapp and Bernard Vanlauwe at the 4th International Symposium for Farming Systems Design, Lanzhou, China, 19-22 August 2013