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Study materialThe Constituent Assembly: Drafting the Indian Constitution, B.R. Ambedkar and Key DebatesThe Constituent Assembly of India, established in 1946, was responsible for drafting the Indian Constitution, with Dr. B.R. Ambedkar as its principal architect, and it engaged in significant debates on rights, representation, and the structure of governance. Current affairsRishikesh-Karnaprayag Rail Project: 41st Tunnel Breakthrough — Escape Tunnel-1 Completes 10.847 kmRail Vikas Nigam Limited (RVNL) completed the 41st tunnel breakthrough on the Rishikesh–Karnaprayag New Broad Gauge Rail Line Project with the final breakthrough of Escape Tunnel-1 — 10.847 km long and the second-longest tunnel in the project — marking a major step toward completing India's most tunnelled railway project in the Himalayas. Current affairsMoSPI Revises GDP Base Year to 2022-23: PPI Replaces WPI, Double Deflation Adopted — What Changes and Why It MattersThe Ministry of Statistics and Programme Implementation (MoSPI) has released the National Accounts Statistics (NAS) 2026 with a revised base year of 2022-23, replacing the earlier 2011-12 series. The Wholesale Price Index (WPI) has been replaced by the Producer Price Index (PPI) for GDP deflation, and India has adopted the Double Deflation Method — aligning with IMF standards and providing a more accurate picture of sectoral value addition in the economy.