Six (yes six!) constraints

an enhanced model for project control

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Project professionals have long recognized cost, time, and scope as the constraints influencing a project's outcome. Prince2 has expanded this list to include quality, benefits, and risks. This paper examines a model for managing these six constraints. In doing so, it defines each constraint and describes each constraint's theoretical and practical functions; it overviews two scenarios of using a risk model to gauge a project's risk tolerance. It then explains how project managers can control projects and mitigate deviations by effectively managing the six constraints, listing four examples showing how project managers can prevent a project constraint from exceeding its expected limits. It also identifies how the six constraints relate to the PMBOK Guide's process flow, noting the ways that the constraints affect the processes of project planning and project monitoring/control.

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