Dennis Ross, International Council Member at the Belfer Center for Science and International Affairs, argues in Politico that the key to a successful nuclear agreement with Iran is not the physical rollback of the Iranian program, but the transparency measures that allow the P5+1 to assess Iranian behavior. Specifically, he suggests that Iran is probably maneuvering to maintain the diplomatic "red lines" stated by Supreme Leader Ayatollah Ali Khamanei regarding sanctions relief and enrichment, and so to both allow Iran to stay within most of their public limits while still assuaging American concerns, extremely robust verification measures are required.
Ross, Dennis. “How to Save the Iran Deal.” April 23, 2015
The full text of this publication is available in the link below.