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St David’s 2 Shopping Centre
A Project Case Study

“St David’s 2” Shopping Centre

Question 1. Draw a project network diagram of this project. Determine the shortes

t time to complete the project. Identify the critical activities.
Task ID A B C D E F G H I J Task Description Planning and Consultation Service Diversions Highways Enabling Appoint Main Contractor CPO Inquiry Obtain Government Approval Construct John Lewis Store Demolition Main Scheme Construction Refurbishment of St David’s Centre Duration (Months) 9 9 3 3 3 3 24 12 30 30 Cost (?Millions) 12 15 10 4 12 2 36 80 210 50 Precedence A B A A E C, D, F C, D, F H C, D, F

K
L M N O P Q

Library Construction
John Lewis Fit-out Main Scheme Fit-out Library Fit-out Residential Homes Public Realm Opening

21
15 3 12 12 3 3

70
9 25 16 92 28 4

C, D, F
G I K H I L, M, N

Project Network Diagram

Activities A, B, C, H, I, M and Q are critical. The project duration is 69 months. Question 2. Convert the project diagram in a Gantt Chart. Schedule the non-critical activities as late as possible.

Gantt Chart

Question 3. Determine the most cost effective way to complete this project within 56 months given the following information
Task ID A B C D E F Task Description Planning and Consultation Service Diversions Highways Enabling Appoint Main Contractor CPO Inquiry Obtain Government Approval Normal Duration (Months) 9 9 3 3 3 3 Normal Cost (?Millions) 12 15 10 4 12 2 36 80 210 50 70 9 25 Crash Duration (Months) 6 2 12 10 24 18 14 9 2 Crash Cost (?Millions) 21 15 -

G
H I J K L M

Construct John Lewis Store
Demolition Main Scheme Construction Refurbishment of St David’s Centre Library Construction John Lewis Fit-out Main Scheme Fit-out

24
12 30 30 21 15 3

60
94 270 68 105 15 50

N
O P Q

Library Fit-out
Residential Homes Public Realm Opening

12
12 3 3

16
92 28 4

6
6 2 -

22
122 35 -

Crash cost ? Normal cost Cost to crash by one period = Normal time ? Crash time
Task ID A B C D E F G H I J K Normal Duration (Months) 9 9 3 3 3 9 24 12 30 30 21 Normal Cost (?Millions) 12 15 10 4 12 2 36 80 210 50 70 Crash Duration (Months) 6 2 12 10 24 18 14 Crash Cost (?Millions) 21 15 60 94 270 68 105 Crash to cost by one month 2 5 2 7 10 1.5 5

L
M N O P Q

15
3 12 12 3 3

9
25 16 92 28 4

9
2 6 6 2 -

15
50 22 122 35 -

1
25 1 5 7 -

Step 1. St David’s in 68 months
Crash activity B one period to 8 periods for a cost of ? 2M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 68 months.

Step 2. St David’s in 67 months
Crash activity B one period to 7 periods for a cost of ? 2M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 67 months. The accumulated project crash cost is now ?4M.

Step 3. St David’s in 66 months
Crash activity B one period to 6 periods for a cost of ? 2M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 66 months. The accumulated project crash cost is now ?6M.

Step 4. St David’s in 65 months
Crash activity C one period to 2 periods for a cost of ?5M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 65 months. The accumulated project crash cost is now ?11M.

Step 5. St David’s in 64 months
Crash activity H one period to 11 periods for a cost of ?7M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 64 months. The accumulated project crash cost is now ?18M.

Step 6. St David’s in 63 months
Crash activity H one period to 10 periods for a cost of ?7M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 63 months. Activity H was crashed one period to 10 periods for a cost of ? 7M. The accumulated project crash cost is now ?25M.

Step 7. St David’s in 62 months
Crash activity I one period to 29 periods for a cost of ? 10M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 62 months. The accumulated project crash cost is now ?35M.

Step 8. St David’s in 61 months
Crash activity I one period to 28 periods for a cost of ? 10M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 61 months. The accumulated project crash cost is now ?45M.

Step 9. St David’s in 60 months
Crash activity I one period to 27 periods for a cost of ? 10M.

Activities A, B, C, H, I, M and Q are critical. The project duration is 60 months. The accumulated project crash cost is now ?55M.

Step 10. St David’s in 59 months
Crash activity I one period to 26 periods for a cost of ? 10M.

Activities A, B, C, H, I, M, Q, G and L are critical. The project duration is 59 months. The accumulated project crash cost is now ?65M.

Step 11. St David’s in 58 months
Crash activity I one period to 25 periods for a cost of ? 10M and crash L one period for a cost of ?1M.

Activities A, B, C, H, I, M, Q, G and L are critical. The project duration is 58 months. The accumulated project crash cost is now ?76M.

Step 12. St David’s in 57 months
Crash Activity I one period to 26 periods for a cost of ?10M and crash L one period for a cost of ?1M.

Activities A, B, C, H, I, M, Q, G and L are critical. The project duration is 57 months. The accumulated project crash cost is now ?87M.

Step 13. St David’s in 56 months
Crash activity M one period to 2 periods for a cost of ? 25M and crash L one period for a cost of ?1M.

Activities A, B, C, H, I, M, Q, G and L are critical. The project duration is 56 months. The accumulated project crash cost is now ?113M.

The crash cost – project duration trade-off


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