This report provides a summary of the Subsidiary Body for Scientific and Technological Advice (SBSTA) event on quantified economy-wide emission reduction targets of developed country Parties. The event was held in conjunction with the thirtyeighth session of the SBSTA in Bonn, Germany, on 6 June 2013. As part of the SBSTA work programme on clarification of quantified economy-wide emission reduction targets of developed country Parties, the event addressed assumptions and conditions related to these targets, the identification of common elements for measuring progress towards the achievement of these targets and the comparability of mitigation efforts