UN nuclear agency chief to visit Tehran

"... They cautioned that signing such a deal was only the first step, adding that its implementation was the true test of Iranian willingness to end more than four years of refusing to work with the IAEA probe after some initial cooperation.

Still, if Iran does abide by such a deal and give the IAEA the access it seeks, that could result in putting to rest the dispute over whether the Islamic Republic hid such work from the rest of the world...."