This document was compiled by CODATU association at the request and underthe supervision of the Agence Française de Développement (AFD). It was written byPablo Salazar Ferro in close collaboration with Lise Breuil (AFD) and Julien Allaire(CODATU). The first version of the document, issued in November 2014, has beenupdated after review from Xavier Godard and Olivier Ratheaux.