Ryan Costello of the National Iranian American Council links to an earlier analysis by Jofi Joseph for the Belfer Center on verification and transparency measures in his good analysis of the obstacles confronting a final deal between Iran and the P5+1:
http://www.huffingtonpost.com/ryan-costello/iran-nuclear-gridlock-is_b_5517019.html?utm_hp_ref=tw
http://www.huffingtonpost.com/ryan-costello/iran-nuclear-gridlock-is_b_5517019.html?utm_hp_ref=tw