Write a book and your an expert...that's how it is in USA. Mr. Tedeschi is an EXCELLENT designer...exceptional...BUT he has too few years of training and even less of a grand knowledgeof Korean Hapkido. Traditional Hapkido is not this book. Where is the Aikido influence? (International Hapkido Federation for instance). Myung Sung Kang not interviewed?? How to defend yourself with a book???--Give me a break.Not worth the money.