The focus of critical care has evolved from saving lives to preservation of function. Morbidity rates in pediatric critical care are about double mortality rates. Morbidity includes complications of disease and medical care. In pediatric critical care, functional status morbidity is an intermediate outcome in the progression towards death, and is the result of the same factors associated with mortality including physiological profiles (PRISM), and case-mix factors. The Functional Status Scale (FSS) developed by CPCCRN, a NIH research consortium, is a validated, granular, age-independent measure of functional status that has proven valuable and practical even in large outcome studies.