6 The activities involved in a project, their durations, immediate predecessors and the number of workers required for each activity are shown in the table.
| Activity | Duration (hours) | Immediate predecessors | Number of workers |
| A | 6 | - | 2 |
| B | 4 | - | 1 |
| C | 4 | - | 1 |
| D | 2 | A | 2 |
| E | 3 | A, B | 1 |
| F | 4 | C | 1 |
| G | 3 | D | 1 |
| H | 3 | E, F | 2 |
- Model the project using an activity network.
- Calculate the early and late event times.
- Calculate the independent and interfering float for each activity.
- Draw a cascade chart for the project, showing each activity starting at its earliest possible start time.
- Construct a schedule to show how three workers can complete the project in the minimum possible time.