3.
| Activity | Time taken (days) | Immediately preceding activities |
| A | 5 | - |
| B | 7 | - |
| C | 3 | - |
| D | 4 | A, B |
| E | 4 | D |
| F | 2 | B |
| G | 4 | B |
| H | 5 | C, G |
| I | 10 | C, G |
The table above shows the activities required for the completion of a building project. For each activity, the table shows the time taken in days to complete the activity and the immediately preceding activities. Each activity requires one worker. The project is to be completed in the shortest possible time.
- Draw the activity network described in the table, using activity on arc. Your activity network must contain the minimum number of dummies only.
- Show that the project can be completed in 21 days, showing your working.
- Identify the critical activities.