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No official language. Portuguese serves in this role de facto. Portuguese is also used in government and is the only language of instruction
About 20 (without legal status). Balanta, Pular, Mandjak, Mandinka, and Upper Guinea Creole ("Kriulo" - Portuguese-based) are the most widely spoken.
Ethnologue has an extensive list at http://www.ethnologue.com/show_country.asp?name=GW
The site L'aménagement linguistique dans le monde has a page on Guinea-Bissau at http://www.tlfq.ulaval.ca/axl/afrique/Guinee-Bissau.htm
Institut national de la recherche scientifique
B.P. 37 - BISSAU
(Source: UNESCO, 1985)
UNDP (2006) gives a literacy figure (without reference to which language[s]) of: 40%
An orthography for the languages of Guinea-Bissau was designed in 1946. (Lopes, 1946)
(See also specific language pages.)
Not aware of any software localisation activities.
(See also specific language pages.)
International Telecommunications Union (ITU). 2006. World Information Society Report 2006. Geneva: ITU. http://www.itu.int/osg/spu/publications/worldinformationsociety/2006/wisr-web.pdf
Internet World Stats: Africa. 2006. http://internetworldstats.com/africa.htm
Leclerc, Jacques. L'aménagement linguistique dans le monde, "Guinée-Bissau," http://www.tlfq.ulaval.ca/axl/afrique/Guinee-Bissau.htm
Lopes, E. C. (1946). O conhecimento das linguas da Guiné Portuguesa e a possibilidade de uma grafia una. Boletim cultural de Guiné Portugesa 1., pp. 453-456.
SIL International, Ethnologue: Languages of the World, "Languages of Guinea-Bissau," http://www.ethnologue.com/show_country.asp?name=GW
UNDP. 2006. ''Beyond scarcity: Power, poverty and the global water crisis. Human Development Report 2006.'' New York: United Nations Development Programme (UNDP). [Human development index Adult literacy rate (% ages 15 and older) (HDI) http://hdr.undp.org/hdr2006/statistics/indicators/3.html ]
UNESCO Regional Office for Education in Africa. 1985. African Community Languages and Their Use in Literacy and Education: A Regional Survey. Dakar: UNESCO.