Union Public Service Commission: the constitutional framework in Articles 315 to 323

Background

The UPSC's own website lists its Constitutional Provisions as Articles 315 to 323.
Article 315 provides for Public Service Commissions for the Union and for the States.
Article 316 covers appointment and term of office of members, and Article 317 covers removal and suspension of a member.
Article 318 empowers regulations on conditions of service of members and staff; Article 319 prohibits members from holding certain offices after they cease to be members.
Article 320 sets out the functions of Public Service Commissions, Article 321 the power to extend those functions, Article 322 their expenses and Article 323 their reports.