The royal decree governing the selection of NRC members was announced on Thursday.
In a nutshell, there will be 88 selection committees proposing up to 935 candidates to be shortlisted by the National Council for Peace and Order (NCPO) to 250.
Election Commission (EC) secretary general Puchong Nutrawong said the NCPO would announce two types of selection committees soon.
The first type of selection panels consists of 11 seven-member committees, one for each area to be reformed, all appointed by the NCPO.
The 11 areas to be reformed are: politics, public administration, laws and judicial process, local administration, education, economy, energy, public health and environment, mass media, social affairs and others.
The 11 committees will each shortlist up to 50 candidates to be proposed by non-profit juristic persons, which can nominate two each.
The other type is the provincial selection committees, one for each of the 76 provinces and Bangkok.
The 76 provincial selection committees comprises the governor, chief judge of the provincial court, chairman of the provincial administration organisation, representatives of the community organisation councils at the provincial level and chairman of the provincial election commission.
For Bangkok, the selection committee consists of president of the Council of University Presidents of Thailand, chief justice of the Civil Court, Bangkok Metropolitan Administration permanent secretary and chairman of the Bangkok election commission.
The provincial and Bangkok selection committees will each choose five candidates who are local people in their respective areas.
The NCPO will then handpick one NRC member for each of the provincial and Bangkok lists and any number as it sees fit from the reform-area lists but not more than 250 total.
Mr Puchong said juristic persons could start proposing the candidates immediately and the names of the organisations wishing to do so would be announced on Aug 13.
Non-profit jusristic persons include government agencies, state enterprises, public organisations, foundations, councils, state-owned educational institutions or hospitals and associations. Notably, political parties are also allowed to propose names.