Actual performance and progress of the project are monitored against the project plan.
Monitoring acquirer progress and performance begins as soon as a plan is established. The acquirer is responsible for monitoring the progress and output of the project. After a supplier is
selected and a supplier agreement put in place, the acquirer’s monitoring and control activities extend to the supplier and its activities. The acquirer monitors supplier progress, including achievement of requirements established in the supplier
agreement and using specified process, product, and service level measures.
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CMMI-ACQ 1.2
4. 
SG 1 Monitor Project Against Plan