The 73rd Constitutional Amendment Act, 1992, mandates a three-tier system of Panchayati Raj for states with a population above 20 lakhs. These tiers are: 1. Village level: Gram Panchayat 2. Block level: Panchayat Samiti or Block Panchayat 3. District level: Zila Parishad or District Panchayat For states with a population below 20 lakhs, the intermediate (block) level may not be constituted. However, the standard and constitutionally mandated system for larger states is three-tier.