The paper outlines what ex-ante information would need to be provided in order to understand commitments, and explores whether guidance could take the form of “bounded flexibility” for the various dimensions describing mitigation commitments in order to provide a basis for post-2020 emissions accounting and tracking progress. It also describes possible stages of the process for establishing commitments for the 2015 agreement. Son adoption doit intervenir en 2015 au plus tard, et son entree en vigueur en 2020.