Once a substantial number of Case Studies had been completed and a draft version of the reference tool had been developed, three regional workshops were held, to share the preliminary findings and to gain further insight from PPP practitioners into their challenges during PPP contract management. The first workshop was in Bogota, Colombia, the second in Singapore, and the third in Rome, Italy, with attendees from regional Procuring Authorities, private sector organisations as well as multilateral development banks. Feedback and additional lessons learned from the workshops were then incorporated into the final reference tool.