1. Muhammad Yasin bin Abdul Rahman, known as Yassin Affandi, was a Bruneian politician who served as the president of the National Development Party from 2005 to 2010.

1. Muhammad Yasin bin Abdul Rahman, known as Yassin Affandi, was a Bruneian politician who served as the president of the National Development Party from 2005 to 2010.
Yassin Affandi worked with AM Azahari during the Brunei revolt of 1962, when they called for the unification of Brunei, Sarawak, and North Borneo under a single administration.
On 19 May 1922, Yassin was born in Kampong Sungai Matan, which is located outside of Bandar Seri Begawan.
Yassin Affandi was employed by the British Military Administration in Labuan as a clerk and translator after the war.
Yassin Affandi was offered the chance to work part-time as a ground crew in the air defence in Labuan.
Yassin Affandi was involved in the March 1946 Malay-Chinese clash at Labuan.
Yassin Affandi began work at British Malayan Petroleum Company in Seria at the end of 1947 as a storekeeper and advanced to senior local staff by the middle of 1948.
Yassin Affandi was involved at an early age in the Barisan Pemuda movement, which Sultan Ahmad Tajuddin supported.
Yassin Affandi was elected to the position of General-Secretary of BARIP Belait and Seria Branch.
Yassin Affandi was enthralled by the Sultan's battle, decided to launch an underground campaign against British colonialism with his companions after the British disabled BARIP in 1948.
Yassin Affandi traveled to London in 1957, accompanied by the late Azahari and Zaini Ahmad, on behalf of PRB, to confer with the Colonial Office on the Brunei Constitution's draft.
Yassin Affandi added that Yassin was a really docile kind of man and he has never heard him raise any objections to Azahari.
Yassin Affandi was elected in August 1962 to the position of District Councillor.
Yassin Affandi was the "Overall Commander" of TNKU, who on 8 December 1962, read Kalimantan Utara proclamation of independence, marking the start of the Brunei revolt.
Yassin Affandi was wounded in action after a fight with Royal Gurkha Rifles near the river mouth of Brunei River, in the marshes surrounding Brunei Bay.
Yassin Affandi was trusted to represent the PRB independence mission to the United Nations in July and November 1975, together with Azahari and Zaini Ahmad, to present a petition to assert Brunei's independence.
Yassin Affandi went on to co-found the National Development Party in 2005, and was chosen as the party's president at its inaugural general congress in June 2006.