The latest round of Iran nuclear talks are off to a "good start" with six world powers and Iran planning to meet again March 17.
By late July, Western governments hope to reach a deal that would end suspicions that Iran is seeking the capability to make a nuclear bomb, an aim it denies.
Tehran wants economic sanctions lifted.
European Union foreign policy chief Catherine Ashton.
(SOUNDBITE) (English) EUROPEAN UNION FOREIGN POLICY CHIEF, CATHERINE ASHTON, SAYING:
"We have had three very productive days during which we have identified all of the issues we need to address in reaching a comprehensive and final agreement. There is a lot to do. It won't be easy, but we have made a good start."
Iranian Foreign Minister Mohammad Javad Zarif agrees.
(SOUNDBITE) (Farsi) IRANIAN FOREIGN MINISTER AND HEAD OF HIS COUNTRY'S DELEGATION, MOHAMMAD JAVAD ZARIF, SAYING:
"We discussed issues that we needed to talk about in order to reach a final and comprehe