Question

1. In terms of creating a timeline, what is meant by the critical path of a PERT chart?

Answer 1

"... the critical pathway is the longest pathway in the process. The process cannot end before the critical pathway ends."

Check out this link, for more informtion about the critical path of a PERT chart.
http://www.robertluttman.com/vms/Week4/page5.htm

Answer 2

This page goes into a bit more detail on the critical path of a PERT chart: http://pert-chart.biz/pert-chart-diagram/