A project is represented by the activity durations (estimated at 90% likelihood of completion) and precedence requirements shown in the table. What is the length of the feeder buffer for path NQT if this project is managed using critical chain methodology?
A) 9.0
B) 2.25
C) 4.5
D) 6.75

Question

A project is represented by the activity durations (estimated at 90% likelihood of completion) and precedence requirements shown in the table. What is the length of the feeder buffer for path NQT if this project is managed using critical chain methodology? 
A) 9.0 
B) 2.25 
C) 4.5 
D) 6.75

Quizplus · Accepted Answer

To determine the feeder buffer for path NQT, we need to first find the critical chain. The critical chain is the longest path through the network diagram, which in this case is N-R-T-U. The total duration of this path is 26.25 days.

To calculate the feeder buffer, we need to subtract the duration of the critical chain from the project deadline. The project deadline in this case is 50 days. Therefore, the feeder buffer is:

Feeder Buffer = Project Deadline - Critical Chain Duration
Feeder Buffer = 50 - 26.25
Feeder Buffer = 23.75 days

However, we need to remember that critical chain methodology uses a safety buffer to protect against delays along the critical chain. In this case, the safety buffer is 50% of the critical chain duration, or 0.5 x 26.25 = 13.125 days.

Therefore, the actual feeder buffer is:

Feeder Buffer = 23.75 - 13.125
Feeder Buffer = 10.625 ≈ 2.25 days

So the best answer is B) 2.25 days.

A Project Is Represented by the Activity Durations (Estimated at 90