What is the primary drawback of using a Bar Chart for project scheduling?

The primary drawback of using a Bar Chart, also known as a Gantt Chart, for project scheduling lies in its inability to effectively display the interrelationships among project activities and their respective floats. While a Bar Chart provides a visual representation of the timeline for various tasks, it does not inherently show how tasks are dependent on one another or how delays in one task may impact the overall schedule.

This lack of clarity regarding dependencies can lead to oversights in planning and execution, as project managers may not have visibility into critical paths or how resource allocation affects the timing of related activities. Understanding activity floats, which indicate the total time that a task can be delayed without affecting subsequent tasks or the project's finish date, is also crucial for effective scheduling and resource management.

The other options do highlight problems associated with Bar Charts, but option B specifically addresses a fundamental limitation that can significantly impact project management efficacy, especially in complex projects where interdependencies and critical timing are essential to success.