This report provides the conclusions and recommendations of the inventory lead reviewers on options to improve the cost-effectiveness, efficiency and practicality of the review process made during the 10th meeting of the lead reviewers, held in Bonn, Germany, from 18 to 20 March 2013. It is based on discussions held in response to the request by the Subsidiary Body for Scientific and Technological Advice, at its thirty-seventh session, to the lead reviewers to discuss the above-mentioned topic in the context of implementing the work programme on the revision of the guidelines for the review of biennial reports and national communications, including national inventory reviews, for developed country Parties, in accordance with decision 2/CP.17, paragraph 28