I used this book in order to get up to speed on the 3rd Edition PMBOK, since I actually read the 4th addition prior to deciding to test early. This book was extremely helpful and in getting me ready to test in a short period of time. There are a few mistakes that you will run across if you are on your toes, including the one most reported here regarding the 3 point estimate, but overall, if you take it seriously, this book will get you where you need to be. My only warning is that the exam will be based upon the 4th edition soon, so depending on when you plan on testing, you might want to wait for a new edition to this book.