Building and civil engineering refers to NACE 41-42.

For the construction industry, confidence indicators are calculated using the formula: order books (present situation assessment) + number of employed persons (expectations).
The confidence indicator is a mean of the net balances (seasonally adjusted and standardised) for the questions above. This time series is then standardised into a new series with a mean of 100 and a standard deviation of 10 as from 1996.

Further results and information about the Economic Tendency Survey are available at the National Institute of Economic Research. National Institute of Economic Research.