The critical path or pass method is an algorithm for scheduling a set of project activities. As the following diagram shows, the critical path is the longest path from start to finish, indicating the minimum time necessary to complete the entire project. It should be noted here that the critical pass method provides a higher level of insight into your project's timeline and a correlation between tasks, giving you more understanding about which task durations you can modify and which must stay the same. Before you start making the diagram, you should know that CPM is critical because their delay results in the delay of the whole project. The start time for non-critical activities can, to a certain extent, be freely selected.