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Critical Path Analysis
This is a way of demonstrating how a complex project can be completed in the shortest
possible time. It identifies the critical path, these are the activities that must be completed
on time in order to delay the whole project.

Constructing a Network

We will use the…

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EARLIEST START TIME

If we assume that the earliest start time for A is 0, then B and C can not start for 4 hours
(0+4), these figures are shown in the top right hand corner of nodes 1 and 2. Task D
cannot start until A and B have…

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THE CRITICAL PATH

Once all of the LFTs have been identified it is possible to outline the critical path. This can
be drawn through all of the nodes where the ESTs and the LFTs are the same. This means
that there can be no delays between completing the previous tasks…

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Task Duration EST LFT Total Float Free Float
A 4 0 4 0 0
B 6 4 13 3 0
C 7 4 11 0 0
D 8 10 21 3 3
E 10 11 21 0 0
F 9 21 30 0 0
G 5 30 35 0 0…

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