Why seniority-based system?
- The system has been reinforced by judicial decisions over the years, most notably the 1993 Supreme Court Judgment (also known as the Second Judges Case), which established the Collegium system for the appointment of judges.
- Similar systems of seniority-based appointments are seen in some other democracies as well, such as the United Kingdom, where the senior-most judge is usually appointed as the Lord Chief Justice.
Collegium System
- The method used in India for the appointment and transfer of judges to the Supreme Court (SC) and High Courts (HC).
- Consists of the CJI and the four senior-most SC judges for SC appointments; and Chief Justice of High Court and the two senior judges & CJI and two senior-most SC judges for HC appointments.
- Formalized through the Third Judges Case (1998) but not established by Act of Parliament. Hence, has been part of debates.

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