The Business Climate Indicator (BCI) combines 5 industry survey balances into 1 common factor for euro-area manufacturing only. It is published each month by DG ECFIN, the Commission's economics and financial affairs department, with Eurostat disseminating results and metadata. A standing panel of firms is resurveyed each month, with a nominal sample of about 38000 industry units and usable replies about 30% lower.
Its value is read in std-dev points around zero, the long-run average, with above-zero better than usual and below-zero adverse. It moves at the same time as overall industrial activity on a fairly smooth path, and a turn needs at least 2 months to confirm. It differs from the industrial confidence indicator, which uses only 3 series and a different method. It does not cover services, construction, retail trade or consumers, and it does not measure industrial output itself.