This book gave me exactly what I was looking for. I was looking for a book that was not a tutorial because they only tell you how, not why. This book explains why to do many necessary things in family creation. I already knew how to create a reference plane, dimension, and a solid. With this book, I now also understand the best way to bring them all together, as well as tips and tricks that can make my job easier. I no longer have to alt/tab between help pages and websites. This book brought all that I needed to know the in-depth processes needed to make the highest quality families. Thank you for writing this, it is the best book I have in my Revit library.