This report provides a summary of the third workshop on quantified economy-wide emission reduction targets by developed country Parties. The workshop was held in Bonn, Germany, on 17 May 2012, during the first part of the fifteenth session of the Ad Hoc Working Group on Long-term Cooperative Action under the Convention. The workshop addressed, through presentations, subsequent question and answer sessions and a general discussion, the following issues: clarification of the nature and level of the targets communicated by developed country Parties; assumptions and conditions associated with the targets; commonalities and differences of approach in measuring the progress towards the targets; comparability of emission reduction efforts by developed country Parties, and options and ways to increase the level of ambition of the pledges; relevant policies and measures to support the targets, and experience with low-emission development strategies; and possible ways forward