This document provides a summary by the co-chairs of the workshop on the review of the clean development mechanism (CDM) modalities and procedures as requested by Parties in decision 5/CMP.8, which was held in Bonn, Germany, on 8 and 9 June 2013. Discussions aimed to facilitate the identification of changes to the modalities and procedures to be prepared by the Subsidiary Body for Implementation for recommendation to the Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol at its ninth session. Discussions were focused on issues relating to governance, accreditation, the project cycle and methodologies under the CDM