Below are the data for a Time-Cost CPM Scheduling model analysis. The time is in days....
Below are the data for a Time-Cost CPM Scheduling model analysis. The time is in days.
| Activity | Immediate Predecessor | Normal Time | Crash Time | Normal Cost | Crash Cost |
| A | None | 4 | 3 | 202 | 383 |
| B | A | 5 | 3 | 303 | 601 |
| C | A | 1 | 1 | 190 | 285 |
| D | B and C | 5 | 4 | 509 | 543 |
| E | D | 4 | 2 | 502 | 898 |
What is the total time of this project? Please give your answer in days
What are the total normal cost of this project? Please give your answer in $.
If you crash this project to reduce the total time by one day (keeping the cost as low as possible), what is the total cost of the project? Please give your answer in $.
If you crash this project to reduce the total time by three days (keeping the cost as low as possible), what is the total cost of the project? Please give your answer in $.
Homework Answers
ALL CHAINS
ABDE = 18
ACDE = 14
CRITICAL PATH = LONGEST PATH = ABDE, DURATION = 18
CRASHING
CRASH COST PER PERIOD = (CRASH COST - NORMAL COST) / (NORMAL TIME - CRASH TIME)
FOR 1 PERIOD CRASH
|
ACTIVITY |
NORMAL TIME |
CRASH TIME |
NORMAL COST |
CRASH COST |
COST / PERIOD |
TIMES CRASHED |
# CRASH |
CRASH COST |
|
A |
4 |
3 |
202 |
383 |
181 |
0 |
||
|
B |
5 |
3 |
303 |
601 |
149 |
0 |
||
|
C |
1 |
1 |
190 |
285 |
0 |
|||
|
D |
5 |
4 |
509 |
543 |
34 |
1 |
1ST |
34 |
|
E |
4 |
2 |
502 |
898 |
198 |
0 |
||
|
TOTAL COST |
1706 |
34 |
FOR 3 PERIOD CRASH
|
ACTIVITY |
NORMAL TIME |
CRASH TIME |
NORMAL COST |
CRASH COST |
COST / PERIOD |
TIMES CRASHED |
# CRASH |
CRASH COST |
|
A |
4 |
3 |
202 |
383 |
181 |
0 |
||
|
B |
5 |
3 |
303 |
601 |
149 |
2 |
2ND 3RD |
298 |
|
C |
1 |
1 |
190 |
285 |
0 |
|||
|
D |
5 |
4 |
509 |
543 |
34 |
1 |
1ST |
34 |
|
E |
4 |
2 |
502 |
898 |
198 |
0 |
||
|
TOTAL COST |
1706 |
332 |
MAX POSSIBLE CRASH
|
ACTIVITY |
NORMAL TIME |
CRASH TIME |
NORMAL COST |
CRASH COST |
COST / PERIOD |
TIMES CRASHED |
# CRASH |
CRASH COST |
|
A |
4 |
3 |
202 |
383 |
181 |
1 |
4TH |
181 |
|
B |
5 |
3 |
303 |
601 |
149 |
2 |
2ND 3RD |
298 |
|
C |
1 |
1 |
190 |
285 |
0 |
|||
|
D |
5 |
4 |
509 |
543 |
34 |
1 |
1ST |
34 |
|
E |
4 |
2 |
502 |
898 |
198 |
2 |
5TH 6TH |
396 |
|
TOTAL COST |
1706 |
909 |
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