The two common tools for project management schedule development are the Gantt and PERT chart. Both of these are great resources for planning and displaying the critical path of a project, however, they have their differences. In the simplest form A Gantt chart is basically a bar chart and a PERT chart is a flow chart. The Gantt allows you to view which tasks are happening simultaneously, assign resources to each task, and allow you to track progress of each task. The PERT chart while including project tasks and time allocation, also display dependency. The PERT chart also allows you to view several different time structures as to when a task can be expected to be completed, either earlier, expected, or later. Most Project Managers will end up using both to plan a large scale project.