Book excerpt: Designed to be a primary reference for chiropractic students, this is a concise, scientific survey of chiropractic theories based on current research. Completely restructured for the Fourth Edition, this book focuses on the most current biomedical research on the three phase model of vertebral subluxation complex (V.S.C.). This is a useful reference for students studying for the National Board of Chiropractors Examination Parts II, III, and IV, as well as a post-graduate reference providing information on the chiropractic perspective on health and wellness, nutrition, exercise, psychosocial issues, and case management principles for wellness care. This new text focuses on developing critical thinking among chiropractic students, and includes new contributors and new chapters on principles of statistics and a minimum process for validation of chiropractic theory.