A project network diagram is a visual way to represent the project workflow. It clearly displays the duration of project activities, their chronological order, and logical dependencies between the activities (unlike the WBS – work breakdown structure). As the below diagram illustrates, the first person is on vacation for the entire first week. At the same time, the second person is working on another project throughout the second and third week. That being said, the third person is on sick leave at the start of the second week. And the fourth person remains on vacation for the third week. This chart would be really helpful for a project manager to understand whether they have to allocate their resources in the best way possible.