COLING. MILLER ANDDEREKPEARSON 1. 1. Why a Book about Clinical Trials in Osteoporosis? There have been many books published about the design, conduct, and analysis of clinicaltrials. Whyareosteoporosistrialsaspecialcasethatdeserveabookoftheir own? There are three main reasons. First, most diseases have a well-understood definitionandaetiology. Osteoporosisisadiseasethatisunderstoodbythosewo- ing within the subspecialty, but currently there is no definition that is agreeable to both medical and scientific communities and its aetiology is poorly understood. It is within this framework that the...