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Execution refers to the following processes:
Acquire the Resources necessary for the Job. The quantity and nature of the resources must have been previously planned.
Thus Material is acquired by issuing Purchase Orders to a Supplier, Subcontractor resources are acquired by issuing Work Orders to a Subcontractor etc.
Consume the Resources - for instance Material needs to be issued from Stock into Project Consumption.
Compensate for the Resources - Pay the Supplier for Material delivered, the Subcontractor for Work Done etc.
Bill the Customer for the Work Done.
The modules used for the above processes include: Procurement, Logistics, Operations, Equipment, HR and Finance.