Phase 1: 73rd Constitutional Amendment Act (1992).
\nThe 73rd Constitutional Amendment Act conferred constitutional recognition upon Panchayati Raj Institutions (PRIs). \n\n
Phase 2: Essential Constituent Bodies.
\n- Gram Sabha: Comprises registered voters at the village level. \n- Panchayats: Operates on a three-tiered structure: Village Panchayat, Intermediate Panchayat, and District Panchayat. \n\n
Phase 3: Items Not Included.
\n- Municipal council and Ward committee fall under the purview of the 74th Amendment Act (governing Urban Local Bodies), and are not part of the 73rd Amendment. \n\n \n\[\n\boxed{\text{Panchayat and Gram Sabha}}\n\]