The UNFCCC process and international peer pressure could play an important role in encouraging governments to raise the level of ambition of their commitments when domestic political conditions allow. The periodic review or consultation could have both substantive dimensions (e.g. consideration of commitments in light of the latest climate science) and procedural dimensions (e.g. the timeline and who undertakes the process). However, it would be challenging for all countries to synchronise their potential revisions of commitments because the length of policy cycles and dates of election cycles are different in every country.