I have used Head First PMP for my PMP preparation. I have been recommending the book to everyone. The beauty of the book is the way it explains the concepts. For every concept, the book describes a scenario to make us help understand the concept. Just like any other book in Head First series, there is always the fun part in learning. There are questions, crossword puzzles, etc to test your understanding.
Yes, we did our best to make sure that each of the concepts -- especially Time Management, Cost Management and Scope Management concepts -- are explained very thoroughly. A big part of the Head First approach is to take a difficult concept and explain it in several ways. It turns out that sort of redundancy makes the concept sink into several parts of your brain (there's some more advanced cognitive theory behind that), and it makes it much easier to remember. We have many Q&A sections in each chapter, where we try to answer many of the most common questions people ask. We also use lots of scenarios to show how each concept applies in real life. We have many exercises and puzzles to give you practice. And we used a lot of graphics and visual design to keep the book from being boring and giving you that "eyes glazed over" feeling.
Based on the feedback we've gotten from our readers, the approach really worked.
Author of Head First Agile, Learning Agile, Beautiful Teams, Head First C#, Head First PMP, and Applied Software Project Management (O'Reilly)
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Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop