Delivery on time is most crucial in project management. As a project manager if you have that art of maintaining this consistency over a period of time then you can call yourself a superb project manager. But then you have to ensure that this delivery on time has happened without any changes in the other variables like resources and financials. This is quite difficult to achieve. That is where you will find this book written by Mark J. Woeppel handy in getting you mastered on the subject with practical life insights.