A criticalpath is the series of tasks that will push out the project’s end date if any of those tasks are delayed .The word critical in this context has nothing to do with how important these tasks are to the overall project. It refers only to how their scheduling will affect the project’s finish date; however, the project finish date is of great importance in most projects.
If you want to shorten the duration of a project to bring in the finish date, you must begin
by shortening (also referred to as crashing) the critical path .