4 Deva is having some work done on his house. The table shows the activities involved, their durations and their immediate predecessors.
| Activity | Immediate predecessors | Duration (hours) |
| A Have skip delivered | - | 3 |
| B Remodel walls | A | 3 |
| C Buy new fittings | - | 2 |
| D Fit electrics | B | 2 |
| E Fit plumbing | B | 2 |
| F Install fittings | C, E | 3 |
| G Plastering | D,E | 2 |
| H Decorating | F, G | 3 |
- Model this information as an activity network.
- Find the minimum time in which the work can be completed.
- Describe the effect on the minimum project completion time of each of the following happening individually.
(a) The duration of activity A is increased to 3.5 hours.
(b) The duration of activity D is increased to 4 hours.
(c) The duration of activity F is decreased to 2 hours.
The decorators working on activity H cannot work for 3 hours without a break. - How would you adapt your model to incorporate the break?