Art? Science? A delicate, difficult-balance-to-strike combination of both?
It's long been my theory that groups of people get things done in spite of themselves. To me, it's astounding that people in groups accomplish anything, what with competing agendas, immaturity, group-think, dunderheadedness, and other factors arranged against them.
Regardless, this is the profession I've chosen - the discipline of making things happen despite the fact that people (and technology) are involved.
Microsoft (my company's patron saint) has a vested interest in making project managers out of people. Thus, this book excerpt. Interesting reading.