This document provides an elaborated recommendation from the Joint Implementation Supervisory Committee to the Subsidiary Body for Implementation on an accreditation system for joint implementation (JI) aligned with that of the clean development mechanism (CDM), taking into consideration decision 6/CMP.8, paragraph 15(b), and the implications thereof, as requested by the Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol at its ninth session. This elaborated recommendation proposes a closely aligned accreditation system through the establishment of a joint accreditation committee under the authority and supervision of the two constituted bodies, in accordance with decisions 3/CMP.1 and 9/CMP.1, which would carry out accreditation functions under both the CDM and JI.