Prime Minister Mohamed Ghannouchi, a longtime ally of Ben Ali, and several top ministers retained their posts in the shake-up. Ghannouchi also announced that political prisoners would be freed, among an array of measures aimed at loosening up a political system that for decades was effectively under one-party rule.
A key question was whether the changes in the government lineup would be enough to stabilize the North African country that has been reeling amid continued unrest after Ben Ali fled fled on Friday - 23 years after he first took power.
Ghannouchi, who has been premier since 1999 and has kept his post throughout the upheaval, said the current ministers of defense, interior and foreign affairs would keep their posts.
Three opposition figures, including Nejib Chebbi, a founder of the opposition PDP party, will take up posts in the government - a breakthrough in a country that the autocratic Ben Ali led for more than two decades.
Until new presidential elections are held, the country is being run by interim president Fouad Mebazaa, former speaker of the lower house of parliament, also a veteran of Tunisia's ruling party.
Ghannouchi said all nongovernmental associations that seek it would be automatically recognized, and all the restrictions on the Tunisian League for the Defense of Human Rights would be lifted.
Many opponents of Ben Ali's rule have taken to the streets to express their hopes that the new government would not include of any remnants of his iron-fisted regime.
The downfall of Ben Ali, who had taken power in a bloodless coup in 1987, delivered a warning to other autocratic leaders in the Arab world.
The improved quality of life for many failed to keep up with the increased limits on civil rights like freedom of expression. The jobless rate is officially 14 percent, but is thought to be far higher among young who make up more than half of its 10 million people.
Tunisians have been living under a government "characterized by corruption, graft, abuse, and repression, and they've been brutalized," Steven Cook of the Council of Foreign Relations told CBS News in an interview Sunday. "They have had no personal political freedom combined with limited economic opportunity."
The self-immolation, and eventual death, of a 26-year-old university graduate selling fruits in central Tunisia last month triggered a series of protests that, relayed by social media like Facebook, spun into general anger against the regime.
Dozens of people have died in a month of clashes between police and protesters angry about the repression and corruption during Ben Ali's rule - unrest that ultimately marked the end of his 23-year regime.
Tunisia Police Arrest Head of Presidential Guard
Arab Reformists Hope Tunisia Inspires Change
On Monday, security forces fired tear gas to repel angry demonstrators ahead of the announcement. In a later march, a small, peaceful gruop of youths carried signs reading "GET OUT" - under the gaze of watchful police, part of hundreds of security forces in the capital.
A union leader upset at the prospect of a government full of old guard ministers, predicted growing demonstrations to press for an end to power positions for the RCD.
"It (RCD) left by the back door and is coming back through the window," said Habib Jerjir, member of the executive bureau of the Regional Workers' Union of Tunis. "We can't have militias in the streets and in the government.
Ghannouchi said the government would create three new state commissions to study political reform, investigate corruption and bribery, and examine abuses during the recent upheaval.
Ghannouchi didn't refer to the prospect of new elections, which under Tunisia's constitution must be called within 60 days. But some members of the opposition want more time, to allow the public to get know the choices in a country known for one-party rule - and possibly on the cusp of democracy.
"The RCD still holds the power," said Hedi Guazaouni, 29. With the potential for change after Ben Ali's flight from the country Friday, "This is a chance not to be missed," he said.
Hylel Belhassen, a 51-year-old insurance salesman, summing up the concerns of some, saying: "We're afraid that the president has left, but the powers-that-be remain. We're afraid of being manipulated."
The European Union said Monday it stands ready to help Tunisia become a democracy and offer economic aid.
Finance Minister Christine Lagarde of France - a former colonial overseer of Tunisia - told French radio Monday that Paris is keeping a close watch on the assets of Tunisians in French banks.
During a visit to neighboring Algeria on Monday, U.S. President Barack Obama's top counterterrorism official John Brennan said the United States stands ready to help Tunisian government in holding "free and fair elections in the near future that reflect the true will and aspirations" of Tunisians.
Moncef Marzouki, a professor of medicine who leads the once-banned CPR party from exile in France where he has lived for the last 20 years, told France-Info radio he would be a candidate in the presidential election.
"The question is whether there will be or won't be free and fair elections," said Marzouki, whose movement is of the secular left.
Whatever emerges, the new leadership will first face the challenge of restoring order. Looting, gunbattles, and score-settling have roiled the country since Friday, when a month of street protests against years of repression, corruption and a lack of jobs brought down Ben Ali.
Shops in the center of Tunis remained shuttered Monday, and police were deployed in force. A semblance of normal daily life returned in other areas of the capital where shops, gas stations, pharmacies and supermarkets reopened. Many people returned to their jobs and others rushed to buy scarce stables like bread, fish and milk.
Hundreds of stranded tourists were still being evacuated from the country, and foreign airlines gradually resumed the flights that were halted when Tunisian airspace closed amid the upheaval.
Over the weekend, police arrested dozens of people, including the top presidential security chief, as tensions appeared to mount between Tunisians buoyant over Ben Ali's ouster and loyalists in danger of losing many perks.
Ex-presidential security chief Ali Seriati and his deputy were charged with a plot against state security, aggressive acts and for "provoking disorder, murder and pillaging," the TAP state news agency reported.
Fierce gunbattles broke out between the two groups around the presidential palace Sunday in Carthage on the Mediterranean shore, north of Tunis and near the Interior Ministry in the capital.
The protests began last month after an educated but jobless 26-year-old set himself on fire when police confiscated the fruits and vegetables he was selling without a permit. His desperate act - from which he later died - hit a nerve, sparked copycat suicides and focused anger against the regime into a widespread revolt.
Reports of self-immolations surfaced in Egypt, Mauritania and Algeria on Monday, in apparent imitation of the Tunisian events.