Egypt's opposition groups say government proposals on how to end the political crisis are not enough.
The banned Muslim Brotherhood and other groups took part in landmark talks with the government after 13 days of street protests aimed at forcing President Hosni Mubarak to resign.
The government has proposed a review body to amend the constitution.
The opposition says the talks are only a first step and the government's offer is insufficient.
President Mubarak has refused to resign immediately, saying that to do so would cause chaos and has said instead that he will not stand for re-election in September.
Tens of thousands have again joined demonstrations in Cairo and other cities, calling for him to quit.
Meanwhile, many banks opened for the first time in a week, drawing long queues as people waited to withdraw money.
In all, six groups were represented at the talks hosted by Vice-President Omar Suleiman, including a coalition of youth organisations, and a group of "wise men".
Egyptian state TV said the participants had agreed to form a joint committee of judicial and political figures tasked with suggesting constitutional amendments.
It was the first time the government and the long-banned Brotherhood have held talks.
However, the Muslim Brotherhood said the talks would only continue if the government makes progress on meeting its demands:
- the immediate resignation of President Mubarak
- lifting emergency laws
- dissolving parliament
- releasing all political prisoners
"Our demands are still the same," senior Brotherhood figure Essam el-Erian told reporters in Cairo. "They didn't respond to most of our demands. They only responded to some of our demands, but in a superficial way."
The BBC's Jon Leyne, in Cairo, says opposition members and the "wise men" who were also there told him they were sceptical of the government's moves.
Leading opposition figure Mohamed ElBaradei was not at the talks but one of his representatives met Vice-President Suleiman separately.