Anurag Prasad Karthikeyan D. Harpreet Singh Mritunjay Choudhary
THE CAMPUS WEDDING ± Case A
Question 1: Given the activities and preferences relationships described in the case, develop a network diagram for the wedding plans? Answer: The various activities leading to the
wedding day are listed under along with the time
required for each activity. Sl. No
Activity
Days
A
Church and Reception Hall Booking
1
B
Church Notice
17
C
Church Decoration
3
D
Choose Cake
2
E
Jack¶s Catering ± Notice
Charge if crashed
10 days / $100
10
F
Rehearsal Dinner
1
G
Get Gifts
1
H
Maid of Honor from Guatemala
10
I
Fit Dress
2
J
Clean and Press
2
K
Choose Pattern
3
L
Receive lace
8
5 days/$ 25
M
Sew Dress
11
6 days/ $ 120 for each day
N
Choose Invitation
2 days/$ 500
1 day / $ 30
3
O
Printing of Cards - Bob¶s Press
12
5 days / $ 35
P
Address Invitation
4
2 days /$ 25 for each day saved
Q
To Post Office
1
R
Invitation Lead Time
10
S
Prepare guest list
1
The network relationship diagram is drawn below:
B
A(1)
C (3)
(17)
D (2)
E (10)
F (1)
G (1)
END H (10)
J (2)
I (2)
START
K (3)
L (8)
M (11)
N (3)
O (12) P (4)
Q (1)
R (10)
S (4)
Qu estion 2: Identify the paths which are critical? Answer: The
start node denotes the day 31st of March and the end node denote the wedding day i.e.
the 22nd April. The various paths obtained from the network diagram are: P ath
1: A-B-C: Length 21 days
P ath
2: D-E-F: Length 13 days
P ath
3: G-F: Length 2 days
P ath
4: H-I-J: Length 14 days
P ath
5: K-L-M: Length 26days
P ath
6: N-O-P-Q-R: Length 30days
P ath
7: S-P-Q-R: Length 19 days.
The family has 21 days for the preparation, so any path more than or equal to 21 days is critical and might need to crashing to accommodate the wedding on the 22nd day. The Path 1 is exactly 21 days, the path 5 and 6 are more than 21 days and hence all are critical but path 5 and 6 have to be crashed. Qu estion 3: What is the minimum-cost plan that meets the April 22 date? Answer: P ath
5
Time would be reduced to receive Lace to 5 days (cost $25), reduce Clean & Press to 1 da y (cost $30), and hire Mrs. Watson 1 day to reduce Sew Dress to 10 (cost $120) days. This would reduce the path length to exactly 21 da ys at a cost of $175. (This is assuming it is possible to hire Mrs. Watson for just 1 day).
P ath
6
Time would be reduced to receive the Invitations to 5 days (cost $35) and hire help to address Invitations to reduce this time to 2 days (cost $50). This would reduce the path length to exactly 21 days at a cost of $85. The minimum cost to have the wedding on 22nd April is $260 ($175 + $85)
CAMPUS WEDDING ± Case B
S c enario 1:
On April 1 the Chairman o f Vestry Committee at the church was left un impressed by
the added donation and said he wouldn¶t reduce the notice period from 17 to 10 days Answer: There
won¶t be any problem as the Path 1 A-B-C is exactly 21 days and a non-reduction in
the notice period won¶t affect the wedding plans. S c enario 2:
A call to Guatemala revealed that the potential bridesmaid had several commitments
and could not possibly leave the country until April 10
Answer: If the bridesmaid cannot
start before 10th April it is a problem as under normal
circumstances she will be taking 10 days to rea ch which means 20th April and then she needs another 4 days to fit and clean her dress; even if we crash the cleaning and pressing to 1 day still it will be late . The solution is to fly down the bridesmaid in 2 days which will cost another 500$ which will leave enough time for the dress fitting and cleaning. S c enario 3:
Answer: The
Mother came down with the four-day flu just as she started on the guest list
path 7 will be affected and since this path is already 19 days long a delay of 4 days to
start the activity will result in non-completion of all the activity before the wedding day, hence another alternative has to be considered. S c enario 4:
The lace and dress materials were lost in transit. Notice of the loss was delivered t o
Jackson home early on April 10 th
Answer: Since the information was received on 10
April the family has just 11 days to complete the
process of acquiring the laces and then s ewing before fitting and cleaning. The option the family has is to acquire laces as early as possible and then depending on the days available take the services of Mrs. Watson and see to it they have at least 3 days in hand for trial and washing. Hiring Mrs. Watson is costly and hence will have an impact on the total cost of the wedding also care should be taken as this is critical path and has already been crashed before. S c enario 5:
There was a small fire at the ca terer¶s shop on April 8. It was estimated th at the shop
would be closed two or three days for repairs Answer:
If the notice was given prior to the accident and the caterer takes an extra 2-3 days then
there should not be any problem as the path 2 is of 13 days and delay of 2-3 days should not affect the wedding plan.
