It is an index that reflects the prevailing direction of economic trends in the manufacturing and service sectors.
It has a diffusion index that summarizes whether market conditions are expanding, staying the same, or contracting as viewed by purchasing managers.
It is a monthly survey released by the Institute for Supply Management (ISM), of supply chain managers across 19 industries, covering both upstream and downstream activity.
The PMI is based on five major survey areas, all are weighed equally:
New orders
Inventory levels
Production
Supplier deliveries
Employment
A PMI above 50 represents an expansion and under 50 represents a contractionwhen compared with the previous month.