The Index of Eight Core Industries (ICI) is often described as a bellwether for India's industrial health. Critically examine the structural limitations of ICI as a policy tool and suggest reforms to improve its coverage and timeliness.

The Index of Eight Core Industries, compiled by the Office of the Economic Adviser (DPIIT), covers 40.27% of the weight of items in the Index of Industrial Production [1], making it India's earliest monthly read on industrial momentum — but its narrow, energy-heavy design limits how far policy can lean on it.

Its strength as a bellwether

• Tracks eight upstream inputs — coal, crude oil, natural gas, refinery products, fertilizers, steel, cement, electricity — whose output cascades into all downstream manufacturing [1].
• Released monthly, weeks ahead of IIP and GDP data, giving it genuine lead-indicator value.

Structural limitations

• Hydrocarbon dominance: refinery products alone carry a 28.04% weight; with crude oil, gas and coal, fuels account for over half the basket [2]. In May 2026 the index grew only 0.5% because refinery (−8.7%) and coal (−9.3%) output fell, even as steel (+5%), cement (+8.4%) and electricity (+8.7%) expanded [1] — masking real construction-led demand.
• Volume-only measure: it captures physical production, not value addition, prices, capacity utilisation or employment.
• Coverage gaps: services, MSMEs, the informal sector and most downstream manufacturing lie outside it; returns are PSU-heavy.
• Timeliness–accuracy trade-off: provisional estimates are routinely revised in the following month's release [1].
• Conceptual flaws: the old series double-counted coal, as washed coal and middlings derived from raw coal were separately included [3].

Reforms — some already under way

• The revised ICI series with base year 2022-23, released on 20 July 2026, adds iron ore as a core industry, retains only raw coal to remove double counting, and provides a 38-month back series for comparability [3].
• Periodic, rule-based rebasing; weights redistributed pro-rata from the updated IIP basket [3].
• Supplement with GST, e-way bill and electricity-load data for faster, wider proxies; publish disaggregated, seasonally adjusted series.

ICI remains indispensable as an early-warning signal, but is a thermometer, not a diagnosis. Read alongside GST collections, PMI and capacity-utilisation surveys — and strengthened by the 2022-23 rebasing — it can evolve into a sharper instrument for evidence-based industrial policy.