By Jonathan Head
South East Asia correspondent, BBC News
Vo Van Kiet moved Vietnam towards a market economy
Vo Van Kiet, the architect of Vietnam's transformation from a socialist system to one of the world's fastest-growing market economies, has died aged 85.
Mr Kiet was unusual among communist leaders for his blunt criticism of government policy.
He became prime minister in 1991 and held office until he stepped down in favour of Phan Van Khai in 1997.
He had been in poor health in recent days and died at a Singapore hospital, relatives said.
Among the grey ranks of Vietnam's communist leadership few figures have ever stood out.
One of the few was former Prime Minister Vo Van Kiet.
VO VAN KIET
Prime Minister: 1991 - 1997
Seen as a reformer, helped create Doi Moi
Joined Indochinese Communist Party in 1939
Credited as the author of the reforms known as Doi Moi, which have transformed Vietnam's economy, he was a rarity among senior officials in speaking out publicly against the failings of the communist system.
Born in a village in the Mekong Delta, he was a veteran fighter in the long war against French and then American military forces in South Vietnam.
His first wife and four children died in the war.
After the communist victory in 1975 he became party secretary of Saigon, and quietly defied hard-line official policy by trying to work with officials and businesses associated with the defeated government.
His experiments with diluting orthodox socialism in the city eventually encouraged the communist party to adopt market reforms for the whole country in 1986, at a time when the economy was in ruins.
It took many years for those reforms to take root - but as prime minister Mr Kiet presided over a period of dramatic economic growth and foreign investment.
He remained an outspoken critic of official corruption and an advocate of reconciliation with opponents of communist rule - arguing that the brutal re-unification of north and south after 1975 had caused pain to millions.