What is Critical Chain Project Management (CCPM) and its buffering concept?

What is Critical Chain Project Management (CCPM) and its buffering concept?

• A. CCPM focuses on resource constraints and uses buffers only for budgeting, not time.
• B. CCPM eliminates the use of buffers in favor of fixed due dates.
• C. CCPM relies on traditional critical path method without buffers.
• D. CCPM uses project buffers and feeding buffers to protect due dates.

Answer: (D)

In CCPM, the schedule is built around the critical chain and uncertainty is absorbed with buffers rather than padding every task. A project buffer sits at the end of the chain to protect the final due date from delays on any path, while feeding buffers are placed on non-critical paths that feed into the critical chain to prevent variability there from pushing the critical chain off track. This approach reduces micromanagement of individual task safety times and focuses on protecting due dates with strategically placed buffers. The other options miss this buffering mechanism entirely: buffers are indeed used, not avoided or limited to budgeting, and CCPM modifies the traditional CPM by adding these buffers rather than relying on a fixed-date, no-buffer approach.

In CCPM, the schedule is built around the critical chain and uncertainty is absorbed with buffers rather than padding every task. A project buffer sits at the end of the chain to protect the final due date from delays on any path, while feeding buffers are placed on non-critical paths that feed into the critical chain to prevent variability there from pushing the critical chain off track. This approach reduces micromanagement of individual task safety times and focuses on protecting due dates with strategically placed buffers. The other options miss this buffering mechanism entirely: buffers are indeed used, not avoided or limited to budgeting, and CCPM modifies the traditional CPM by adding these buffers rather than relying on a fixed-date, no-buffer approach.