Exhibit 15

Exhibit 15.4
The following questions are based on the information below.
A company needs to manage a project which consists of the following set of activities:
Activity
Days Required
Predecessor Activities
A 1 −
B 4 A
C 3 B
D 3 C
E 2 B
F 4 E
G 2 D,F
-Refer to Exhibit 15.4.The following spreadsheet was developed to determine the earliest start times and latest start times for the project.Based on the data in the spreadsheet,which activities are on the critical path?
$\begin{array}{|r|r|r|r|r|r|r|r|r|r|}\hline&A&B&C&D&E&F&G&H&I\\\hline 1 & \text { Activity } & \text { Description } & \text { Predecessor } & \text { Time } & \text { EST } & \text { EFT } & \text { LST } & \text { LFT } &\text { Slack } \\\hline 2 & \text { A } & \text { Activity A } & & 1 & 0 & 1 & 0 & 1 &0\\\hline 3 & \text { B } & \text { Activity B } & \text { A } & 4 & 1 & 5 & 1 & 5 &0 \\\hline 4 & \text { C } & \text { Activity C } & \text { B } & 3 & 5 & 8 & 5 & 8 &0\\\hline 5 & \text { D } & \text { Activity D } & \text { C } & 3 & 8 & 11 & 8 & 11 &0 \\\hline 6 & \text { E } & \text { Activity } \mathrm{E} & \mathrm{B} & 2 & 5 & 7 & 5 & 7 &0\\\hline 7 & \mathrm{~F} & \text { Activity F } & \mathrm{E} & 4 & 7 & 11 & 7 & 11 &0 \\\hline 8 & \text { G } & \text { Activity G } & \text { D, F } & 2 & 11 & 13 & 11 & 13&0 \\\hline\end{array}$