Thailand

A person shall enjoy the liberty to unite and form a political party under the democratic regime of government with the King as Head of State, as provided by law.
The law under paragraph one shall at least contain provisions relating to the administration of a political party which must be transparent and accountable, provide party members opportunities to widely participate in defining policies and nominating candidates for election, and prescribe measures to ensure that the administration be carried out independently and free from manipulation or inducement of any person who is not a member of such party, as well as oversight measures to prevent members of a political party from committing any act which violates or contravenes laws relating to election. (Sec. 45)

Any political party which sends a candidate for election on a constituency basis shall have the right to send a candidate for election on a party list basis.
In sending a candidate for election on a party list basis, each political party shall prepare one list of candidates, in which candidates for election of each political party shall not be the same as others’ and not be the same as the names of candidates for election on a constituency basis. Such list of candidates shall be submitted to the Election Commission prior to the end of the period for application for candidacy for election of Members of the House of Representatives on a constituency basis.
In the preparation of a list of candidates under paragraph two, the members of the political party shall be allowed to participate in the deliberations, and regard shall be had to the candidates for election from different regions and equality between men and women. (Sec. 90)

There shall be the following organic acts:
…
4. Organic Act on Political Parties;
… (Sec. 130)

National reform in various areas shall be carried out to at least achieve the following results:
a. Politics:
...
2. ensuring that activities of political parties are organised in an open and transparent manner to enable political parties to develop into political institutions of the people who share a common political ideology, and have clear and concrete processes to ensure that members of the political party truly participate and are accountable for political activities and the selection of persons with knowledge, competence, integrity and good morality and ethics to be persons holding political positions;
3. having a mechanism to determine accountability of a political party for promoting policies that have not been subjected to a thorough assessment of impact, cost effectiveness and risk;
... (Sec. 258)