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 project buffer if this project is managed using critical chain methodology? $\begin{array}{|l|l|l|l|l|l|}
\hline \text { Activity } & \text { Predecessor } & \text { Length } & \text { Activity } & \text { Predecessor } & \text { Length } \
\hline \mathrm{M} & - & 8 &\mathrm{R} & -- & 12 \
\hline \mathrm{N} & - & 8 & \mathrm{~S} & \mathrm{P} & 14 \
\hline \mathrm{P} & \mathrm{M} & 12 & \mathrm{~T} & \mathrm{R}, \mathrm{Q} & 7 \
\hline \mathrm{Q} & \mathrm{N} & 10 & \mathrm{~V} & \mathrm{~S}, \mathrm{~T} & 11\
\hline
\end{array}$

A)13.5
B)22.5
C)11.25
D)9.0

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 project buffer if this project is managed using critical chain methodology? $\begin{array}{|l|l|l|l|l|l|}
\hline \text { Activity } & \text { Predecessor } & \text { Length } & \text { Activity } & \text { Predecessor } & \text { Length } \
\hline \mathrm{M} & - & 8 &\mathrm{R} & -- & 12 \
\hline \mathrm{N} & - & 8 & \mathrm{~S} & \mathrm{P} & 14 \
\hline \mathrm{P} & \mathrm{M} & 12 & \mathrm{~T} & \mathrm{R}, \mathrm{Q} & 7 \
\hline \mathrm{Q} &  \mathrm{N} & 10 & \mathrm{~V} & \mathrm{~S}, \mathrm{~T} & 11\
\hline 
\end{array}$

A)13.5
B)22.5
C)11.25
D)9.0

Quizplus · Accepted Answer

To calculate the project buffer for critical chain methodology, we need to first calculate the critical chain. The critical chain is the longest path through the project network, accounting for both task durations and precedence relationships. 
In this case, the critical chain is A-D-E-F-G-H, which has a total duration of 27.5 days (5 + 6.5 + 4 + 6 + 6 + 0 + 6). 
To calculate the project buffer, we take 50% of the duration of the critical chain, which gives us 13.75 days. However, we need to round down to the nearest half-day, as the project buffer can only be measured in half-day increments. Therefore, the project buffer for this project is 11.25 days (rounded down from 13.75). 
Therefore, the correct answer is C.

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