This thesis develops two related themes.The first is that participatory approaches to agricultural research and extension can provide a sound process for all stakeholders to learn how to develop more sustainable agriculture. The second is that appropriate levels of participation can be used to link knowledge from three important sources: local knowledge, scientific knowledge and experiential knowledge.The thesis develops these two related themes by examining the inconsistencies between esposed theories of participatory approaches (i.e.intended behaviour) and theories in action (i.e. what is actually practised).The study was based upon the work of a major research, development and extension (R, D and E)project known as the Western Farming Systems Project (WSFP),which was concerned with the development of sustainable rotations and cropping practices in south western Queensland and north western N.S.W. between 1994-1999. The study was conducted in the Balonne Shire, centred on the town of St. George, Queensland, Australia. / Master of Science (Hons)