Schedule Development

Critical Chain Method

The Critical Chain Method (CCM) is one of the methods used to perform Schedule Network Analysis that takes into account task dependencies, limited resource availability, and buffers.  It’s used to prepare the project schedule when limited or restricted resources are available. The goal of CCM is to eliminate project schedule delays due to uncertainties, overestimation of task duration, and wasted internal buffers.

In this method, the Program Manager (PM) usually schedules all or most of the high-risk or critical activities in the earlier stage of the project schedule. This allows the critical tasks to be completed early as well as gives buffers to handle unexpected problems if arise. Also, the PM will combine several tasks into one task and assign one resource to handle all.

The six (6) steps involved in the CCM are:

  1. Identify all activities and dependencies
  2. Construct a Schedule Network Diagram
  3. Define constraints
  4. Determine critical path
  5. Determine buffers
  6. Apply resource availability

The CCM has three (3) different types of Buffers which are:

  1. Resource buffer: is inserted just before a critical chain activity where a critical resource is required. It’s used to remind the project team that a resource is needed and to finish up prior activities.
  2. Feeding buffer: is inserted as a safety margin in the non-critical chain of a network schedule. It’s placed where the path feeds back into the critical chain path.
  3. Project buffer: the summation of all the internal buffers added to each project task or activity.

AcqLinks and References:

Updated: 6/20/2018

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