What does the term "planning hierarchy" refer to?

The term "planning hierarchy" refers to the structured layers from scope to schedule to cost within a project. This concept emphasizes the relationship and interdependency between different planning elements throughout a project's lifecycle.

At the top of the hierarchy is the project scope, which defines what is included and what is excluded in the project. The scope is then broken down into smaller components, typically represented in a Work Breakdown Structure (WBS). Once the scope is clear, scheduling can occur; this involves determining the timelines for each activity and understanding how they fit together to create a coherent schedule. Finally, cost estimation is layered on top of the schedule, with budgeting being informed by the scope and timing of tasks.

Understanding this hierarchy is crucial for effective project management, as it provides a systematic approach to ensuring that all aspects of the project are aligned and can be managed effectively. By recognizing the flow from scope through schedule and into cost, project managers can better anticipate challenges and allocate resources where they are needed most effectively.