VIENNA, Feb. 20 -- EU's foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif announced on Thursday the timetable for the next round of Iranian nuclear talks.

At a joint press conference, speaking of the nuclear talks between Iran and the P5+1 -- China, Britain, France, Russia, the United States plus Germany -- in Vienna, Ashton said we had "three very productive days," during which, all the involved parties discussed "all of the issues we need to address in reaching a comprehensive final agreement."

"We have set a timetable of meetings, initially over the next four months with a framework to continue our deliberations," she said.

Ashton also said that there is a lot to do and it would not be easy, but she stressed that "we made a good start."

She also said that technical experts will meet in early March and the involved parties will reconvene for the next world powers' political directors' meetings led by Ashton and Zarif in Vienna on March 17.