In: Operations Management
Create Gantt Chart and network Diagram
Task | Precedes | Optimistic | MostLikely | Pessimistic | Norm$ | CrashTime | Crash$ | |
A | D | 4 | 4 | 4 | 1000 | 3 | 1301 | |
B | E | 2 | 3 | 28 | 1391 | 4 | 2000 | |
C | F | 2 | 4 | 12 | 2000 | 4 | 2713 | |
D | G | 2 | 3 | 22 | 1198 | 5 | 1400 | |
E | G | 1 | 4 | 7 | 899 | 3 | 1100 | |
F | H | 7 | 10 | 19 | 2500 | 6 | 3765 | |
G | H | 1 | 3 | 11 | 792 | 3 | 1450 | |
H | none | 2 | 2 | 8 | 300 | 1 | 504 |
For each activity, calculate the expected time µ = (a + 4m + b)/6, where a is optimistic, m is most likely and b is pessimistic time.
Activity | a | m | b | Expected Time (µ) |
A | 4 | 4 | 4 | 4 |
B | 2 | 3 | 28 | 7 |
C | 2 | 4 | 12 | 5 |
D | 2 | 3 | 22 | 6 |
E | 1 | 4 | 7 | 4 |
F | 7 | 10 | 19 | 11 |
G | 1 | 3 | 11 | 4 |
H | 2 | 2 | 8 | 3 |
Calculate Early Start and Early Finish times of activities to create the Gantt chart
Earliest Start (ES) is calculated by forward path method as latest of the predecessor activities' Earliest Finish (EF). Then calculate Earliest Finish = Earliest Start + Activity Duration