Methodological progress in on-farm regional agronomic diagnosis. A review Thierry Doré, Cathy Clermont-Dauphin, Yves Crozat, Christophe David, Marie-Hélène Jeuffroy, Chantal Loyce, David Makowski, Eric Malézieux, Jean-Marc Meynard and Muriel Valantin-Morison Agron. Sustain. Dev., 28 1 (2008) 151-161 Published online: 18 December 2007 DOI: 10.1051/agro:2007031