Survey of purchasing managers of various companies in different sectors conducted and published on a monthly basis. The Purchasing Managers Index is regarded as a leading indicator for economic trends. In the US the ISM index (or Purchasing Managers Index PMI) is produced and published by the Institute for Supply Management (ISM). In addition, since 1997 the ISM also publishes the Purchasing Managers Index service sector; in the Eurozone a Purchasing Managers Index is published by Reuter's.