Consider a project with the following information:
Activity | Duration | Predecessors |
A | 5 | -- |
B | 7 | A |
C | 9 | B |
D | 5 | B |
E | 7 | C, D |
F | 6 | D |
G | 4 | C |
H | 7 | E, F, G |
Activity | Duration | ES | EF | LS | LF | Float |
A | 5 | 0 | 5 | 0 | 5 | |
B | 7 | 5 | 12 | 5 | 12 | |
C | 9 | 12 | 21 | 12 | 21 | |
D | 5 | 12 | 17 | 16 | 21 | |
E | 7 | 21 | 28 | 21 | 28 | |
F | 6 | 17 | 23 | 22 | 28 | |
G | 4 | 21 | 25 | 24 | 28 | |
H | 7 | 28 | 35 | 28 | 35 |
Activity | Duration | Total Float | Resource Hours Needed per Week | Total Resources Required |
A | 5 Weeks | 10 | ||
B | 7 Weeks | 8 | ||
C | 9 Weeks | 7 | ||
D | 5 Weeks | 8 | ||
E | 7 Weeks | 4 | ||
F | 6 Weeks | 6 | ||
G | 4 Weeks | 5 | ||
H | 7 Weeks | 8 | ||
Total |
1. Calculate the total resources required for this project, and create a Resource Loading table, highlighting the activity float.
2. Consider that the maximum resource hours available per week are 10. Which weeks are overcommitted?
3. What options are available for you to resource-level the project? Re-create the Resource Loading table.
Float = LF - EF
Activity | Duration | ES | EF | LS | LF | Float |
A | 5 | 0 | 5 | 0 | 5 | 0 |
B | 7 | 5 | 12 | 5 | 12 | 0 |
C | 9 | 12 | 21 | 12 | 21 | 0 |
D | 5 | 12 | 17 | 16 | 21 | 4 |
E | 7 | 21 | 28 | 21 | 28 | 0 |
F | 6 | 17 | 23 | 22 | 28 | 5 |
G | 4 | 21 | 25 | 24 | 28 | 3 |
H | 7 | 28 | 35 | 28 | 35 | 0 |
Activity | Duration | Total Float | Resource Hours Needed per Week | Total Resources Required |
A | 5 Weeks | 0 | 10 | 50 |
B | 7 Weeks | 0 | 8 | 56 |
C | 9 Weeks | 0 | 7 | 63 |
D | 5 Weeks | 4 | 8 | 40 |
E | 7 Weeks | 0 | 4 | 28 |
F | 6 Weeks | 5 | 6 | 36 |
G | 4 Weeks | 3 | 5 | 20 |
H | 7 Weeks | 0 | 8 | 56 |
1.
Resource loading table with resource histogram:
2.
As it is very clear from the resource histogram, weeks starting from week-13 and up to week-23, the resources are overcommitted i.e. more than 10 per week.
3.
The project cannot be completed within 35 weeks' time if the capacity is 10 hours per week. We can use the floats to balance the load but still overshooting happens in-between. This is shown below:
So, the only alternative is to extend the project beyond 35 weeks as shown:
So, the project has to be delayed by 11 more weeks.
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