The Institute for Supply Management (ISM) reports two separate indexes, one for manufacturing that is released on the first business day of each month, and one for non-manufacturing activity released two business days later. Both indexes relate to the month immediately preceding the release.
The ISM manufacturing index is well established and has proven quite useful for predicting other data released later in the month. The index has five components—employment (20%), production (25%), new orders (30%), inventories (10%), supplier delivery times or vendor performance (15%). Also calculated, but not part of the manufacturing index are export orders, imports and prices paid. The ‘prices paid’ index is frequently given prominence, as it can serve as an early indicator of price pressure. The Federal Reserve pays close attention to this report.
The ISM non-manufacturing index is relatively new and untested, and does not carry the same weight with markets as the manufacturing index. However, with the increasing importance of services to the economy this index is receiving greater attention.