Government
Type: Republic, multi-party since 1991.
Independence: September 24, 1973 (proclaimed unilaterally); September 10, 1974 (de jure from Portugal).
Constitution: Adopted 1984. The National Assembly adopted a new Constitution in 2001, but it was neither promulgated nor vetoed by the President.
Branches: Executive--president (chief of state and head of government), prime minister and council of state, ministers and secretaries of state. Legislature--People's National Assembly (ANP), 102 members directly elected in 1999. Judicial--Supreme Court and lower courts. Administrative Subdivisions: Autonomous sector of Bissau and eight regions. Political Parties: The Party for Social Renovation (PRS) was the ruling party until the September 14 military intervention. Other parties are the African Party for the Independence of Guinea-Bissau and Cape Verde (PAIGC); the Guinea-Bissau Resistance-Ba-Fata Movement (RGB-FM); the Union for Change (UM); Front for the Liberation and Independence of Guinea (FLING); Guinean Civic Forum or (FCG); International League for Ecological Protection (LIPE); National Union for Democracy and Progress (UNDP); Party for Democratic Convergence (PCD); and the United Social Democratic Party (PUSD).
Suffrage: Universal at 18.

Government of Guinea-Bissau
The country is in a transitional period. An ad-hoc committee prepared a pact to form a transitional government. Their goals are to hold Supreme Court elections, organize legislative and presidential elections, and promulgate the new Constitution (adopted in 2001). Most Guineans support this transitional government and its effort to return to the rule of law and rebuild political institutions. However, it is uncertain how long this process will take and whether the transitional government has the capacity to accomplish its stated goals.
source: http://www.state.gov