The 36-member Constitutional Drafting Committee will begin a section-by-section deliberation of 315-section draft constitution on Thursday, CDC spokesman Kamnoon Sidhisamarn said.
Mr Kamnoon said the CDC meeting today agreed to retain Section 172, which stipulates that parliament is allowed to pick an unelected outsider as prime minister during a political crisis.
An outsider PM candidate must receive votes from more than two-thirds of the two houses in order to win while a PM candidate which is MP needs only a simple majority.
In the current draft, if no outsider candidate receives the required votes within 30 days after the parliament convenes, the one with the highest votes will be PM.
The CDC agreed to change this clause and requires the winning outsider to get not less than two thirds of the votes even after the 30-day period has passed.
The CDC also resolved to increase the number of constituency MPs from 250 to 300 and reduce party-list MPs from 200 to 50. The open list method in which voters choose not only the party they like the most but also their favorite MPs will not be used until the electronic voting system is used, Mr Kamnoon said.