PMP in 21 Days | Based on PMBOK 6

A critical path is the longest path in the network.  Each node which falls under critical path has zero or negative float (Slack). Now how do we calculate critical path?? Sample Node I’ve seen various illustrations having different way to calculate CPM, few are: -           The project starts on day 1. -           The project starts on day 0. Both the approaches give same results, however I liked the day 0 approach better, its simpler, easy and lesser room for errors. Example Figure 1 - Example  There are 3 steps to calculate CPM: 1. Forward Pass - To calculate the Early Start(ES) and Early Finish(EF) of node. 2. Backward Pass - To calculate Late Start (LS) and Late Finish(LF) of node. 3. Calculate Float and Thus CPM. The Forward Pass: Forward Pass Illustration We start from first Node or Start node. The works begin on day 0....