The Ministry of Statistics and Programme Implementation (MoSPI) has proposed transition towards the chain-based method of index of Industrial Production (IIP) compilation, as it is undertaking a base-revision exercise of macroeconomic data. In the process of revising the base, the MoSPI is revisiting methodologies, exploring new data sources, and incorporating changes following comprehensive consultations with experts, academicians, users, and other stakeholders, an official statement said. Traditionally, the IIP was compiled using a fixed-base Laspeyres framework, in which sectoral and industry weights remain unchanged until a base-year revision. However, it stated that, with production shifts in response to demand, technological changes, and policy shifts, some industries expand, while others decline or disappear, and entirely new industries or production lines within an industry emerge. Therefore, fixed weights become progressively less relevant, thereby affecting the efficacy o