5.
| Activity | Immediately preceding activity |
| A | - |
| B | \(\boldsymbol { A }\) |
| \(\boldsymbol { C }\) | \(\boldsymbol { A }\) |
| D | A |
| E | \(\boldsymbol { B } \boldsymbol { C }\) |
| F | B C |
| G | \(\boldsymbol { D }\) |
| \(\boldsymbol { H }\) | D |
| I | E |
| \(J\) | E F \(G\) |
| \(K\) | E F \(G\) |
| \(\boldsymbol { L }\) | I J |
The precedence table shows the activities involved in planning an opening ceremony. An activity on arc network is to be drawn to model this planning process.
- Draw the activity network using exactly two dummies.
- Explain why each of the two dummies is necessary.