This textbook is the pits. It's unorganized, and terse in the presentation of the subject matter. A lot of the subject matter being presented is in terms ofexercises that the student must do to gain understanding and progress to future chapers of the book. Also, the hints that are provided to help with the exercisesmany times aren't helpful at all. Although it has introductory in it's title, it assumes prior knowledge of the subject being presented. For a far better, althoughslightly less advanced textbook, refer to Griffith's "Introduction to Elementary Particles". What's way more disheartening than this is that there is a lack of goodParticle Physics textbooks out there. This book definitely doesn't help the cause.