This is the best numerology book that I have ever seen. It is fully comprehensive with chapters explaining the use of numbers, equations, etc. Then there are charts in the back of the book that you can use as a reference. Therefore if you are sitting with a friend you can easily go to their life path, expression, soul urge and birthday numbers (or more) with explanations of each. This book goes into detail of one's numbers as well as names. I find this book trustworthy and not hoaxy or trendy. I greatly appreciate it. Many other Numerologists, however, disagree. Hans Decoz is a good example.
Decoz is a successful Numerologist who believes that the letter W is NEVER a vowel, under any circumstance. And he believes that Y is a vowel ONLY when there is no other vowel in the syllable. (Example: In the name "Kelly," Decoz would consider Y a vowel. In the name "May" he would not. Because the letter A already serves as the vowel in that one syllable. Matthew Goodwin, however, would count both the A and Y in "May" as vowels.) What I just wrote is probably confusing to beginners in Numerology. But anyone who has been studying Numerology for a few years is aware of these differing methods. Personally? I have found the Decoz method to be more accurate. I always read using both methods though. I believe that someone who has a name that can be read two different ways is merely a more complex person.