Advantages of a PERT chart is that it's a great mean for visualizing and communicating progress on projects. They usually help the Project Manager to better manage the project.
Can't post images here to give you a decent example of the PERT chart, here's an article on the subject: http://www.pmhut.com/using-pert-analysis , the article also explains how to make a PERT chart...
A pie chart is called a pie chart because it looks like a piece of pie cut into sections... It ISN'T called a cake chart, because a cake chart would be to controversial. - iow (in other words) - a...