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.

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,[4] and later on 2 March 2011, the SPP, after Chiam, mostly for 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 go to contest Bishan-Toa Payoh GRC.

The chairperson was later succeeded by the SJP's leader Desmond Lim, notable for helping Chiam in managing his town council funds.

In the 2011 elections, neither the NSP (who field a large slate of candidates for the election), SDA, or SPP were successful: SPP's Loh was made a Non-Constituency Member of Parliament although losing the contest to a three-time PAP candidate Sitoh Yih Pin, by a wafer-thin margin of 0.72% or 114 votes; candidate Desmond Lim became the only candidate forfeiting his electoral deposit (S$16,000) in the only three-cornered contest in the newly formed Punggol East SMC (a ward carved out from the neighbouring Pasir Ris-Punggol GRC, which the alliance also contest); and members who joined as independents contesting in Tanjong Pagar GRC (the election's only uncontested constituency) was disqualified during nomination day.

[15][16][17] Due to an alliance, the number of respective seats and the results combined from the four parties (NSP, SJP, SPP and PKMS) were reflected in the table.