What is ISM Manufacturing?

The Institute for Supply Management surveys more than 300 manufacturing firms on employment, production, new orders, supplier deliveries, and inventories. A composite diffusion index of national manufacturing conditions is constructed, where readings above (below) 50 percent indicate an expanding (contracting) factory sector. Export orders, import orders, backlog orders and prices paid for raw and unfinished materials are also measured, but these are not included in the overall index.