Surendra,

Let me begin by saying: Interesting questions, but it's unimportant for the PMP exam. You don't have to know this to pass.

However, if you are truly looking for an answer then I must tell you that I don't know. However, there is one source where you might find this: The PMI published the Value of Project Management Study last year. So please stop by at www.pmi.org and see if you want to purchase that study. I don't think that anyone else has made any real empirical studies that might give you the answer.

Hi Fellow PMP-Aspirants and Gurus,

Is there any rule of thumb which can broadly indicate how much of the total value of a project could generally be attributed to Project Management efforts?

Of course there are wide variety of projects getting executed, conceptulized and planned across different industries. Hence such a question would be too open. But if the answer has to be in the context of Software / IT projects, then, can such indicator be worth seeking?

Thanks and regards,

Surendra Vaidya