9 Robert, a project manager, and his team of builders are working on a small building project.
Robert has divided the project into ten activities labelled \(A , B , C , D , E , F , G , H , I\) and \(J\) as shown in the precedence table below:
| Activity | Immediate Predecessor(s) | Duration (Days) |
| A | None | 1 |
| B | None | 1 |
| C | A | 10 |
| D | A | 2 |
| E | B, D | 5 |
| F | \(E\) | 6 |
| G | \(E\) | 1 |
| H | \(F\) | 1 |
| \(I\) | \(F\) | 2 |
| J | C, G, H, I | 4 |
9
- On the opposite page, construct an activity network for the project and fill in the earliest start time and latest finish time for each activity.
9
- Robert claims that the project can be completed in 20 days.
Comment on the validity of Robert's claim.
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