Ket.: Dimodifikasi dari Biggs (1989, hal. 3), Cornwall and Jewkes (1995, hal. 1669) dan Parkes and Panelli (2001, hal. 88). (Dalam: Emma Jakku, Peter Thorburn and Clare Gambley. “Decision Support Systems for Farm Management: a Theoretical Framework from the Sociology of Science and Technology”. Tropical Landscapes Program, CSIRO Sustainable Ecosystems, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia
QLD 4067. http://www.cropscience.org.au/icsc2004/poster/4/1/1/1219_jakkues.htm, 9 Agustus 2005)