In addition to the Monitor and Control Project Work process, the other process under Integration Management knowledge area and Monitoring and Controlling process group is the Perform Integrated Change Control.
Two things that are a corollary from Monitor and Control Project Work process for Perform Integrated Change Control process are,
1. Since the Project Manager is constantly looking for problems and measuring the project against the project management plan in the Monitor and Control Project Work process, it is inevitable that (s)he will come across changes
2. Since the Monitor and Control Project Work process is continuously performed throughout the life of the project, changes can also occur at any time
So now that we know that changes are inevitable and can pop-up at any time, how do we decide which ones to execute? This is where the Perform Integrated Change Control process chimes in.
Why not implement all the changes? Well, every change is likely to impact one or the other triple constraints and thus it is not feasible to execute all the changes. And it is in the Perform Integrated Change Control process that the decision of whether or not a change needs to be executed is made.
Changes not managed well are going manage your project for you and thus a change management plan is one of the key elements of the project management plan
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