SIR vs SSR: What Is the Difference Between the Two Voter List Revision Processes. Nagpur Today Explains | Understanding India’s Electoral System Nagpur: The Election Commission of India periodically revises electoral rolls to ensure that voter lists are accurate and eligible citizens can exercise their right to vote. Two terms frequently used in this process are Special Intensive Revision (SIR) and Special Summary Revision (SSR). Although both aim to […] The original article was published.