This book is a bit of a joke to be honest. Complete sections/examples are actually a 1:1 copy of the online help which comes with revit for free! And there is actually not much content at all. Pretty useless super basic stuff for the first half and then the last quarter is full of useless conversion/unit tables that you can get for free via google/ wikipedia, too.... I seriously can't understand those 3 (good)reviews above, they must be affiliated with the author...Seriously, just go to something like [...] or similar and you will get 100x better hands on info about revit families than in this book.