A project is represented by the activity durations (in days,estimated at 90% likelihood of completion)and precedence requirements shown in the table.What is the length of the project buffer if this project is managed using critical chain methodology? Use the rule of thumb approach. $$\begin{array} { | l | l | l | l | l | l | }
\hline \text { Activity } & \text { Predecessor } & \text { Length } & \text { Activity } & \text { Predecessor } & \text { Length } \
\hline \text { A } & - & 18 & \text { E } & \text { C, D } & 13 \
\hline \text { B } & - & 16 & \text { F } & \text { C } & 9 \
\hline \text { C } & \text { A } & 22 & \text { G } & \text { E, F } & 15 \
\hline \text { D } & \text { B } & 14 & & & \
\hline
\end{array}$$
A) 8.5 days
B) 17 days
C) 24.5 days
D) 34 days

Question

A project is represented by the activity durations (in days,estimated at 90% likelihood of completion)and precedence requirements shown in the table.What is the length of the project buffer if this project is managed using critical chain methodology? Use the rule of thumb approach. $$\begin{array} { | l | l | l | l | l | l | } 
\hline \text { Activity } & \text { Predecessor } & \text { Length } & \text { Activity } & \text { Predecessor } & \text { Length } \
\hline \text { A } & - & 18 & \text { E } & \text { C, D } & 13 \
\hline \text { B } & - & 16 & \text { F } & \text { C } & 9 \
\hline \text { C } & \text { A } & 22 & \text { G } & \text { E, F } & 15 \
\hline \text { D } & \text { B } & 14 & & & \
\hline
\end{array}$$
A) 8.5 days
B) 17 days
C) 24.5 days
D) 34 days

Quizplus · Accepted Answer

To calculate the project buffer using the rule of thumb approach, we add up half of the duration of all the activities that are on the critical chain. The critical chain in this project is A -> C -> E -> G. 
So, the project buffer = (half of duration of A) + (half of duration of C) + (half of duration of E) + (half of duration of G)
= (0.5 x 18) + (0.5 x 22) + (0.5 x 13) + (0.5 x 15)
= 17
Therefore, the length of the project buffer is 17 days. Option B is the correct choice.

A Project Is Represented by the Activity Durations (In Days,estimated