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The talk could be tougher in the future, as the parties in the talk has to make a subtle agreement which, in Tehran's aspect, should respects Iran's nuclear right while addressing the world concern.
Ahead of the talks, during Ashton's visit to Tehran, she said "there is no guarantee that we will succeed", indicating the gap between Iran and the west is still large.
Iran's negotiators faced domestic pressure to make compromise in the deal, before the talk, 200 Iranian lawmakers issued a statement urging Tehran's negotiators not to withdraw from the rights of the Iranian nation.
Earlier this month, Prime Minister Benjamin Netanyahu told U.S. President Barack Obama that he would never compromise on Israel's security even as the U.S. president sought to reassure him on Iran nuclear diplomacy and pressure him on Middle East peace talks.
The interim deal made in Geneva between Iran and p5+1 group will expire in July, leaving only 4 month for the diplomacy.
All sides agreed that the next round of talk would reconvene on May 7 in Vienna, which would continue to discuss tough issues in the talk.
The three-day talks ended up earlier than planned to honor the Persian Nowruz holidays.
Iran and the six major states struck a 6-month interim deal in Geneva, according to which Iran would suspend some controversial nuclear activities starting on Jan. 20, while western states would lift some sanctions imposed on Iran.