Singapore Democratic Alliance  The Singapore Democratic Alliance (abbrev: SDA; ; Tamil: சிங்கப்பூர் ஜனநாயக கூட்டணி) is an alliance of opposition political parties in Singapore. The alliance was formed ahead of the 2001 elections, with the alliance led by former Singapore Democratic Party (SDP) opposition MP Chiam See Tong, the secretary-general of Singapore People's Party (SPP). Prior to the founding in 2001, then-opposition Member of Parliament (MP) for Potong Pasir Chiam See Tong was a member of Singapore Democratic Party (SDP). Chiam resigned to join Singapore People's Party (SPP) ahead of the 1997 elections due to a leadership schism with another member, Chee Soon Juan, who was made the party's secretary-general. The party was first established in 2001 by Chiam where he want to provide a common grouping under which different opposition parties could stand as a political coalition in elections against the ruling People's Action Party (PAP). The alliance was initially a four-party coalition, which consist of his party of SPP (which adopted the party's logo at the time), as well as the National Solidarity Party (NSP), the Singapore Justice Party (SJP) and the Singapore Malay National Organization (PKMS). Notable members include Cheo Chai Chen and Tan Lead Shake of the SDP and Democratic Progressive Party (DPP) respectively, later joined the SDA where they represent the NSP. The alliance of four parties contested in both the 2001 and 2006 elections. It was the first coalition in post-independence since 1963, after the now-defunct Singapore Alliance Party. After the 2006 elections, two parties withdrew from the SDA before the next election; In 2007, the NSP withdrew in hopes of rejuvenating the party, and later in 2 March 2011, the SPP, after Chiam, mostly due to health reasons, was relieved of his role as chairman after the Council voted for three days earlier, and SPP further cited their disagreements (notably the PKMS) for attempting to invite Reform Party (RP), a party which was newly formed on 3 July 2008, to SDA, and also fielding a successor for the ward (who later went on to choose Chiam's wife, Lina Loh) while Chiam would went to contest Bishan-Toa Payoh GRC.