Northern Ireland Index of Services

The Northern Ireland Index of Services (IOS) is an important short term measure of changes in the output of the private sector service industries within Northern Ireland. The IOS is a quarterly sample survey of around 3,500 companies designed to provide a general measure of changes in the output of the Wholesale, retail, repair, Accommodation & food services; Transport, storage, information & communication; Business services and finance; Other services sectors. It is based on up-to-date information about the output and sales of the services industry. The Index is published quarterly in March, June, September and December of each year.