The Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol, at its seventh session, invited Parties, intergovernmental organizations and admitted observer organizations to submit to the secretariat, by 16 April 2012, their views on the revision of the joint implementation (JI) guidelines. This report synthesizes the information provided by Parties and relevant organizations on the revision of the JI guidelines, taking into consideration their experience of implementing the flexible mechanisms under the Kyoto Protocol and the recommendations on options for building on the approach embodied in JI given in document FCCC/KP/CMP/2011/9. It includes experiences gained and lessons learned in the operation of JI, as well as challenges, barriers and areas for improving the JI guidelines. In total, five submissions were received from Parties, one was received from an intergovernmental organization and two were received from admitted observer organizations