need help with critical path method

Write about how the Critical Path Method is used to develop the project schedule, map this to a project which you have worked on (personally, professionally or academically). 

How has the critical path method kept the project on schedule? 

Or, if the method wasn't used, how could it have helped to keep the project on schedule? 

How was the method ineffective, or what was it lacking? 

Need 1 article or book citation which is not part of the course required reading material.

Rubric

Proper APA format, spelling, grammar, citation, and organization of writing

How Critical Path Method is Used

Correlation to Example

Completeness of Assignment

Due Sunday 9/15 by 10:30 PM CST