Critical path

To determine the critical path of a process, select a step of the process in the Diagram pane and then press the Critical path button in the Evaluation group in the Analysis tab. The following dialog appears:

Select the measure for which you want to determine the critical path and press OK. By default, the Lead time is selected here because usually the longest path in time is the most interesting. But, in this way, you can also find a path with the biggest cost, the biggest break time or  the biggest processing time.