1. Constitutional Article, Part and Schedule: Part V of the Constitution deals with the Union. Article 93 provides for the Lok Sabha to choose its Speaker and Deputy Speaker from among its members. Article 95(1) provides that when the office of Speaker is vacant, the Deputy Speaker performs the duties; if the Deputy Speaker's office is also vacant, the President may appoint a member of the Lok Sabha for that purpose. This is the relevant constitutional basis for the President's role in appointing a Pro tem Speaker when both offices are vacant. Article 99 and the Third Schedule concern members' oaths or affirmations. 2. Amendments and Acts: No separate constitutional amendment or standalone parliamentary statute specifically creates the Pro tem Speaker's appointment procedure. The process follows the constitutional framework and established parliamentary practice. 3. Judicial and legal nuance: No specific Supreme Court judgment is necessary to establish this answer. The Pro tem Speaker facilitates the oath-taking of members and presides over proceedings associated with the election of the regular Speaker. The Lok Sabha itself elects its regular Speaker under Article 93. The constitutional provisions are supported by the text of Articles 93, 95 and 99.