Durations on PERT charts
Look carefully at this table which shows the sequence of tasks in building a brick fence and the duration of each of the tasks.
Task | Nodes | Duration (days) | |
---|---|---|---|
A | Make enquiries and order all materials required | 1 | 2 |
B | Wait for bricks, sand and cement to arrive | 2 | 2 |
C | Clear the site | 2 | 3 |
D | Order concrete to be delivered | 2 | 1 |
E | Dig the trench | 4 | 2 |
F | Pour the footings | 5 | 2 |
G | Footings curing time | 6 | 3 |
H | Load the bricks on the site | 3 | 3 |
I | Mix the mortar and lay the bricks | 7 | 1 |
J | Clean the area | 8 | 1 |
Finish | 9 |
When these times are added to the activity arrows on the PERT chart, an overview of the total job time is given.
Note that there are several pathways through the network, depending on which activity you choose to follow through.