Here’s a look at how the party’s past successions were decided, based on what was revealed on Saturday and in earlier reports.
From 1G to 2G
In 1984 after the general election that year, then Minister for Defence and Second Minister for Health Goh Chok Tong was chosen by his peers to lead the PAP’s second-generation team at an informal meeting. A small group of about six ministers had met and made the decision. Mr Goh was made First Deputy Prime Minister in Mr Lee Kuan Yew’s Cabinet in 1985.
He took over as Prime Minister on Nov 28, 1990. On the same day, Mr Lee Hsien Loong was appointed DPM alongside Mr Ong Teng Cheong.
From 2G to 3G
In the middle of 2004, a group of ministers decided on then DPM Lee Hsien Loong as the third-generation leader.
This decision was made at a lunch hosted by then Home Affairs Minister Wong Kan Seng. The ministers came to a conclusion quickly as they felt that it was a straightforward matter.
On August 12, 2004, then DPM Lee took over as Prime Minister from Mr Goh.
On Saturday, Prime Minister Lee Hsien Loong said: “I was very moved that everybody felt that it was a straightforward matter, and then we came to a conclusion very quickly.”
After the ministers had decided on him, he talked to the ministers of state and other office-holders to get their support before going to the caucus of PAP MPs.
Mr Heng also asked for then Trade and Industry Minister Chan Chun Sing to be his deputy.
Earlier that day, the PAP had named Mr Heng as its first assistant secretary-general and Mr Chan as its second assistant secretary-general.
After the Budget debate ended in March, Mr Khaw took a month to speak to all the stakeholders individually. The views of all the Cabinet ministers - save for PM Lee and Senior Ministers Teo Chee Hean and Tharman Shanmugaratnam - were sought, as well as that of NTUC secretary-general Ng Chee Meng and Speaker of Parliament Tan Chuan-Jin, who were former 4G ministers.