As Iran and the five permanent members of the UN Security Council plus Germany (P5+1) remain engaged in intense discussions on a political framework for a final nuclear deal, much has been written and argued about crucial aspects of the negotiations, such as the extent of uranium enrichment, the future of the Arak heavy water reactor and Fordow, the duration of a final deal and the pace of sanctions relief.
However, less attention has been paid to the one key component that underlies all of the aforementioned: verification.