In CCPM, what is the role of buffers in scheduling?

In CCPM, what is the role of buffers in scheduling?

• A. They absorb variability from non-critical paths and feed into the project buffer to protect due dates.
• B. They replace all task buffers with a single project buffer.
• C. They are used to add time to every task equally.
• D. They are not used in CCPM; only estimates matter.

Answer: (D)

In CCPM, buffers are a built‑in protection against variability in task durations. The schedule is created by shortening estimates on the critical chain and then using buffers to absorb the inevitable delays that happen in real projects. A project buffer sits at the end of the project to guard the due date, while feeding buffers are placed on non‑critical paths that feed into the critical chain. If a task along a feeder path slips, the feeding buffer absorbs that delay before it can affect the critical chain, helping the overall finish date stay on track. This setup means you don’t pad every task equally; instead, you deploy targeted buffers that absorb uncertainty and protect the project deadline.

In CCPM, buffers are a built‑in protection against variability in task durations. The schedule is created by shortening estimates on the critical chain and then using buffers to absorb the inevitable delays that happen in real projects. A project buffer sits at the end of the project to guard the due date, while feeding buffers are placed on non‑critical paths that feed into the critical chain. If a task along a feeder path slips, the feeding buffer absorbs that delay before it can affect the critical chain, helping the overall finish date stay on track. This setup means you don’t pad every task equally; instead, you deploy targeted buffers that absorb uncertainty and protect the project deadline.