The preparation of these guidelines began in 2008 under the supervision of Badi Besbes. Ini- tial work was undertaken by Manuel Luque Cuesta. Workneh Ayalew produced a new draft version of the guidelines, which was presented and discussed at workshops held in Argen- tina, Senegal and Italy. These workshops were attended by 100 scientists, technicians and policy-makers. A revised and updated draft was prepared by Badi Besbes, Workneh Ayalew and Dafydd Pilling. Text boxes were provided by Luis Iñi