4 Bob is extending his attic with the help of some friends, including his architect friend Archie.
The activities involved, their durations (in days) and Bob's notes are given below.
| Activity | Duration (days) | Notes |
| A | Archie takes measurements | 1 | |
| B | Archie draws up plans | 3 | Must come after A |
| C | Plans are approved | 21 | Must come after B |
| D | Bob orders materials | 2 | Must come after B |
| E | Materials delivered | 10 | Must come after D |
| F | Work area cleared | 5 | Must come after A |
| G | Plumbing and electrics | 3 | Must come after C, E and F |
| H | Floors, walls and ceilings | 24 | Must come after G |
| I | Staircase | 2 | Must come after H |
| J | Windows | 1 | Must come after H |
| K | Decorating | 6 | Must come after I and J |
Archie has started to construct an activity network to represent the project.
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- Complete the activity network in the Printed Answer Booklet and use it to determine
- the minimum completion time
- the critical activities
for the project. - Give two different reasons why the project might take longer than the minimum completion time.
- For the activity with the longest float
- calculate this float, in days
- interpret this float in context.