The first four digits of the SBI are the four digits of NACE and the first two digits of the SBI and NACE are the same as the first two digits of ISIC.
NACE Rev 2
ISIC Rev 4
Economic developments made it necessary to adapt the first version of the SBI 2008. In the versions 2012, 2013 and 2014 additional fifth digit subclasses have been added for instance to reflect the growth of retail sale via internet and of the design activities.