An insurance company has decided to modernize and refit one of its branch offices. Some of the existing office equipments will be disposed of but the remaining will be returned to the branch on completion of the renovation work. Tenders are invited from a number of selected contractors. The contractors will be responsible for all the activities in connection with the renovation work excepting the prior removal of the old equipment and its subsequent replacement. The major elements of the project have been identified as follows along with their durations and immediately preceding element:
| Activity | Description | Duration ( weeks) | Immediate Predecessor |
| A | Design new premises | 14 | - |
| B | Select the contractor and arrange details with selected contractor | 7 | A |
| C | Arrange storage of equipment to be retained | 5 | B |
| D | Arrange disposal of equipment not to be retained | 2 | C |
| E | Procure new equipment | 4 | C,G |
| F | Renovations take place | 12 | C,D |
| G | Cleaning after the contractor has finished | 2 | F |
| H | Bringing back retained equipment from storage | 2 | G,E |
Draw the network diagram showing the inter-relations between the various activities of the project.
Calculate the minimum time that the renovation can take from the design stage.
Find the effect on the overall duration of the project if the estimates or tenders can be obtained in 2 weeks from the contractors by reducing their numbers.
Calculate the ‘independent float’ that is associated with the non-critical activities in the network diagram.
i) Here is the network diagram showing the inter-relations between the various activities of the project:
A (14)
|
B (7)
|
C (5)
/ \
E D (2)
| |
G |
| F (12)
H |
\ /
|
End
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