How to find the slack or float and identify the critical path?

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0:36 – Formulas Forward Pass
1:42 – Forward Pass
3:10 – Formulas Backward Pass
3:55 – Backward Pass

Once we know the Early Start and Late Start or Early Finish and Late Finish, we can calculate the slack or float of the activities.
The amount of slack determines the flexibility of the activity and its effects on the duration of the project.
The next step is to identify the critical path. Every project has at least one CP and in the worst case, all paths may be critical. The exact definition of the CP is the longest path through the network.

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