Advantages and disadvantages for Gantt Chart?

The main advantage of the Gantt Charts is that visualizing your project schedule makes it very easy for the Project Manager to communicate the project schedule to various stakeholders as well as to the project team.

The main disadvantage is that Gantt Charts are not well suited for conveying complex dependencies or projects having significant potential variability in completion dates. The PERT chart was devised in the 50's for the Polaris project in order to represent this key missing concept.