Change is usally anything that changes scope, schedule, quality or cost. Now project controls are put in place to ensure that the project maintains its business integrity. Management controls are periodic reviews and reports which check the project cost . resource plans and constraints.

 Now due to lack of control, something could go un noticed and it could bring change to project. Like if cost overrun is not controlled, then CPI will keep increasing and that will cost change to project cost

The sole purpose of this function is to maximize the resources of the company by minimizing the expenses of each area of work or function involved either in the development or in the implementation of the project.