Lets look at this example. There are basically 5 activities in this Project.
If you look at the Network diagram, there are two paths in this Network.
Start, 1, 2, 4, 5, End is one path and Start, 1, 3, 5, End is the second path. Since the duration of the path Start, 1, 2, 4, 5, End is 18 days, which is more than the duration of the path Start, 1, 3, 5, End. The critical path of the Project is Start, 1, 2, 4, 5, End.
Take some time to calculate all the four values, i.e. Early Start, Early Finish, Late start and late finish of the activities. I have written down the values for your verification.
Let me take Activity 3 as an example.
First we will calculate the Early Start and Early Finish dates.
Activity 3 can start only after Activity 1. Since the Early finish of Activity 1 is 3, which becomes the Early Start of Activity 3.
Activity 3 can not start earlier than 3, because Activity 1 is getting completed only than.
So, Early Start of Activity 3 is 3. Since the duration of the activity is 6 days. The Early Finish of Activity 3 is 3+6= 9 days.
Now, lets calculate the late start and late finish of Activity 3.
Late Start of Activity 5 is 14 days. The activity 3 happens just before Activity 5, so the Late Finish of Activity 3 is 14 days. To calculate the late start, you can subtract the duration from late finish. So the Late start of Activity 3 is 14-6=8.
Duration : 0:2:42
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