I highly recommend the book "Making Software: What Really Works, and Why We Believe It". It's a collection of essays showing statistical studies on certain software techniques.
John Graham-Cumming, the author of the article submitted here, has a review of this book on Amazon.com:
http://www.amazon.com/Making-Software-Really-Works-Believe/d...
"This isn't a book about evangelizing the latest development fad, it's about hard data on what does and does not work in software engineering."