Singapore Democratic Alliance
Overview
 
The Singapore Democratic Alliance (abbrev
Abbreviation
An abbreviation is a shortened form of a word or phrase. Usually, but not always, it consists of a letter or group of letters taken from the word or phrase...

: SDA; ) is an alliance of political parties
Political party
A political party is a political organization that typically seeks to influence government policy, usually by nominating their own candidates and trying to seat them in political office. Parties participate in electoral campaigns, educational outreach or protest actions...

 in Singapore
Singapore
Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the...

. The SDA was formed shortly before the 2001 general election
Singapore general election, 2001
The Singapore parliamentary general elections of 2001 were held on 3 November. The People's Action Party, the incumbent ruling party, won 82 out of 84 seats in the election, including 55 walkovers...

 to provide a common grouping under which different opposition parties could stand as a united front in elections against the ruling People's Action Party
People's Action Party
The People's Action Party is the leading political party in Singapore. It has been the city-state's ruling political party since 1959....

 (PAP). The founding Chairman of the SDA was the leader of the Singapore People's Party
Singapore People's Party
The Singapore People's Party is a left of centre opposition political party in Singapore. The party's leader is Chiam See Tong.-Foundation:...

 and former Member of Parliament
Parliament of Singapore
The Parliament of the Republic of Singapore and the President jointly make up the legislature of Singapore. Parliament is unicameral and is made up of Members of Parliament who are elected, as well as Non-constituency Members of Parliament and Nominated Members of Parliament who are appointed...

 (MP) for Potong Pasir
Potong Pasir Single Member Constituency
Potong Pasir Single Member Constituency is a Single Member Constituency in the central region of Singapore.-Location:The SMC encompasses Potong Pasir, Lorong 8 Toa Payoh and Tannery...

, Chiam See Tong
Chiam See Tong
Chiam See Tong is a politician and lawyer from Singapore. He is the country's longest-serving opposition Member of Parliament . Between 1984 and 2011, he represented the constituency of Potong Pasir in Singapore's Parliament....

.

The SDA was initially an alliance of four political parties: the National Solidarity Party (NSP), the Singapore Justice Party
Singapore Justice Party
The Justice Party, Singapore is a political party in Singapore.The party has been based mostly in Marine Parade district of Singapore since the party has taken part in general elections after 1988 by fielding its candidates only at Marine Parade Group Representation Constituency...

 (SJP), the Singapore People's Party
Singapore People's Party
The Singapore People's Party is a left of centre opposition political party in Singapore. The party's leader is Chiam See Tong.-Foundation:...

 (SPP), and the Singapore Malay National Organization (PKMS).

In 2007, the National Solidarity Party withdrew from the alliance.
 
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