In June 2004, the Election Commission of India (ECI) ordered an 'Intensive Revision of Electoral Rolls' in seven northeastern states and Jammu & Kashmir. Alongside, it ordered a 'special summary revision' in Andhra Pradesh, Bihar, Chhattisgarh, Goa, Gujarat, Haryana, Himachal Pradesh, Jharkhand, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Orissa, Punjab, Rajasthan, Sikkim, Tamil Nadu, Uttar Pradesh, Uttaranchal, West Bengal, and several Union Territories. Before this, intensive revisions were done in 20 other states and Union Territories during 2002 and 2003, excluding northeastern states and J&K. Bihar's 2025 Special Intensive Revision (SIR) stands apart. Unlike a usual 'intensive' revision which generally means starting fresh, Bihar’s SIR builds on its 2002-03 electoral roll. It also uses a new pre-printed enumeration form alongside house-to-house checks. Notably, this revision is happening just 4-6 months before scheduled assembly elections, which is rare in India. Previously, the EC had delayed intensive roll revisions in Arunachal Pradesh and Maharashtra because assembly polls were due in October 2004. Instead, Maharashtra had a 'special summary revision' with house-to-house enumeration before those polls. The EC also ordered targeted intensive revisions. For example, in Tamil Nadu in 2004, six municipal areas across 33 constituencies had a special revision after reports showed shortcomings in the 2002 revision. In Gujarat, following the 2002 riots, the EC announced a repeat of special intensive revisions. There are different types of roll revisions: - Intensive Revision: Fresh roll created with at least two visits to households. - Summary Revision: Update to the existing rolls without house-to-house enumeration. - Special Summary Revision: Ordered if inaccuracies or poor coverage are found, with adapted procedures. - Partly Intensive and Partly Summary Revision: Combines existing rolls with verification and claim processes. Chronology shows roll revision practices have evolved since 1950, ranging from annual revisions and staggered intensive revisions to special intensive revisions aligned with technological upgrades like the introduction of EPIC cards. The EC continues to adapt electoral roll revisions to ensure accuracy before elections.