Friday, 14 February 2020

CPM /PERT

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CPM /PERT


? CCPM puts more emphasis on the resources required to execute project tasks in contrast to
the more traditional Critical Path and PERT methods, which emphasize task order and
rigid scheduling.
? The difference between traditional and Critical Chain scheduling is in how uncertainty is
managed.
? In traditional project scheduling, uncertainty is managed by padding task durations, starting
work as early as possible, multi-tasking, and focusing on meeting commitment dates.
? The CCPM approach is identical to the TPM approach up to the point where the project
network diagram is defined and the critical path is identified.
? The traditional project manager would next conduct a resource leveling exercise targeting
resource usage on the critical path.
Software Project Management
Notes ? At this point, the critical chain project manager develops the critical chain plan. Buffers are
segments of time that are placed at the end of a sequence of tasks for the purpose of
protecting the schedule of those tasks.
? Buffers can also be used to protect cost, much like a contingency for unexpected expenses
in a budget.
? The three main types of buffers are Project buffers, Feeding buffers and Resource buffers.
The TPM will see the buffer as nothing more than management reserve.
? The only real similarity between a management reserve and a buffer may be in how they
are managed.


Critical Chain Project Management (CCPM): It is a method of planning and managing projects
that puts more emphasis on the resources required to execute project.
Buffers: Buffers are segments of time that are placed at the end of a sequence of tasks for the
purpose of protecting the schedule of those tasks.
Project Buffers: The project buffer is a time buffer placed at the end of the critical chain to protect
the overall project schedule.
Feeding Buffers: The feeding buffer is a time buffer placed at the end of a sequence of tasks that lead
into the critical chain.
Resource Buffers: The resource buffer is different than the previous buffers. First, it is not a time
buffer. It is a flag, usually placed on the critical chain to alert a resource that it is needed.

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