What do the columns SD, ED, Duration, and % complete represent in project management?

The columns SD (Start Date), ED (End Date), Duration, and % Complete are essential in project management as they encompass critical elements for tracking the progress and scheduling of project tasks. These columns provide crucial data points that directly correlate to the overall management of the project timeline.

When we say that these columns roll up to the parent rows, it means that the information contained in each task's SD, ED, Duration, and % Complete is aggregated and summarized at a higher level (the parent row), which typically represents a larger phase or summary of multiple activities. This hierarchical relationship allows project managers and stakeholders to quickly assess the status and progression of broader sections of the project based on the details of the individual tasks. It fosters a clearer understanding of how tasks contribute to the project's overall timeline and health.

While the other options may suggest important aspects of project management, they do not directly align with the primary function of these specific columns in tracking project performance regarding task scheduling and progress measurement.