Final answer:
The milestone list helps plan the horizontal path of the schedule, while the work breakdown structure (WBS) lays out the vertical.
Step-by-step explanation:
The milestone list is used to plan the schedule timeline horizontally, while the work breakdown structure (WBS) is used to lay out the project vertically. The WBS divides the entire project into manageable hierarchical components, capturing all the tasks that need to be completed. It creates a structure for organizing and estimating the duration, resources, and dependencies of each component. The milestone list and work breakdown structure (WBS) are two vital tools used in project management. The WBS is hierarchical, meaning it breaks down the project into smaller and more manageable sub-projects or tasks. By doing so, it becomes easier to allocate resources, manage dependencies, and track progress. The milestone list, on the other hand, provides a timeline view of the project, highlighting key dates and milestones to be achieved.