Which chart is typically used for representing project schedules with varying timelines for best-case and worst-case scenarios?

The PERT (Program Evaluation and Review Technique) chart is particularly useful in project management because it allows for the visualization of a project’s timeline while accounting for uncertainty in the scheduling process. It illustrates the relationships between various tasks and utilizes the concept of best-case and worst-case scenarios effectively. Each task can have different estimated times for completion, and PERT charts show these variations by highlighting critical paths and potential delays.

This is especially valuable in project planning and risk management, as it helps project managers assess the overall timeframe required to complete the project by encompassing variability in task durations. The ability to incorporate optimistic, pessimistic, and most likely completion times makes PERT charts optimal for displaying scenarios where timelines can change based on different factors.

In contrast, while milestone charts focus on significant events throughout a project's lifecycle, Gantt charts visualize task schedules without specifically addressing variations for best-case or worst-case scenarios. Flowcharts, on the other hand, are more geared toward depicting the flow of processes rather than project timelines. Hence, PERT charts are the best choice for representing project schedules with varying timelines.