
Latest Start time and critical
path
Now we have
the earliest start time let's calculated the latest start
time going from the project finish backwards, giving:

The critical
path is given by the nodes where the EST is the same as
the LST, ie. there is no slack (or float) for the node.
Any delay for a critical task/node delays the overall
project.
If this
process seems obtuse then let's use activities on nodes
...

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