The Doctrine of Basic Structure, a cornerstone of Indian constitutional jurisprudence, was not explicitly present in the original Constitution but evolved through a dynamic and often contentious judicial journey. This journey involved a series of landmark Supreme Court cases that grappled with the scope of Parliament's power to amend the Constitution, particularly concerning Fundamental Rights. From an initial phase where Parliament's amending power was seen as virtually unlimited, through a period of asserting the immutability of Fundamental Rights, the judiciary finally arrived at the nuanced position in the Kesavananda Bharati case, establishing that while Parliament can amend any part of the Constitution, it cannot alter its "basic structure." Subsequent cases have further clarified, applied, and reinforced this doctrine, making it a powerful tool for preserving the fundamental identity and core values of the Indian Constitution.
(Source: Broad understanding synthesized from Laxmikanth, 'Indian Polity'; D.D. Basu, 'Introduction to the Constitution of India'; M.P. Jain, 'Indian Constitutional Law'; Granville Austin, 'Working a Democratic Constitution')