Chen's 2000 pledges
The 'Four Noes and One Not' pledge was made by Taiwanese President Chen Shui-bian during his inaugural speech in 2000 to assure the US he would not do certain things that could lead to formal independence.
The Four Noes were no declaration of Taiwan independence, no change of national title, no push for the inclusion of the 'state-to-state' theory in the constitution and no push for the holding of a referendum to change the cross-strait status quo.
The One Not was to not abolish the national unification guideline and the National Unification Council.
The 'state-to-state' theory was proposed in 1999 by former president Lee Teng-hui who classified cross-strait relations as 'special state-to-state' ties to emphasise the two sides existed as independent entities. In February last year, Mr Chen abolished the national unification guideline and the council tasked with preparing for future union of the two sides over Beijing's Anti-Secession Law.