Thanks are due to Geoffrey Mrema, Gavin Wall, Doyle Baker and François Mazaud for their management support to this work and related activities within the Regular Programme under the responsibility of the Agriculture Support Systems Division of FAO. The author wishes to acknowledge the review, constructive comments and important suggestions from John Dixon, Andrew Shepherd and Antonio Pérez. The editorial work of Cadmo Rosell, the translation into English by Julie Rice, the formatting work by Lynette Chalk and the administrative support from Pauline Gouyou-Beauchamps, Teresa Danieli, Larissa D’Aquilio, Claudia Bastar, Ann Drummond, Donna Kilcawley, Rosemary Petrucci and Angela Scappaticci are gratefully acknowledged.
