Case Study – CTI
Example: Suppose that we are going to carry out a minor redesign of a portable telephone set and its associate packaging at Carrier Telephone Industries (Pvt) Ltd. Islamabad. We intend to test market this redesigned product and then revise it in the light of the test market results, finally presenting the results to the board of the company. The key question is:
- How long will it take to complete this project?
- Draw the Network diagram?
- Calculate the minimum overall project completion time?
Solution: After much thought we have identified the following list of separate activities together with their associated completion times.
Number completion time (days)
1. Redesign product 6
2. Redesign packaging 2
3. Order and receive components for redesigned product 3
4. Order and receive material for redesigned packaging 2
5. Assemble product 4
6. Make up packaging 1
7. Package redesigned product 1
8. Test market redesigned product 6
9. Revise redesigned product 3
10. Revise redesigned packaging 1
11. Present results to the board of directors. 1____
Total Completion Time 30 days
Aside from the list of activities just mentioned, we must also prepare a list precedence relationships indicating activities which because of the logic of the situation, must be finished before other activities can start, i.e. in the list on the last page activity number 1 must be finished before activity number 3 can start. It is important to note that, we try to keep this list to a minimum by specifying only immediate relationship, i-e relationships involving activities that “occur near to each other in time”. Now we come up with the following list of immediate precedence relationship:
Activity Number Activity Number
1 Must be finished before 3 can start
2 4
3 5
4 6
5, 6 7
7 8
8 9
8 10
9, 10 11
Hence 24 days Is the minimum time needed to complete all the activities and hence is the minimum overall project completion time. Thus six days will be saved.
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