This document discusses concepts of health including definitions of health, indicators of health, and classifications of health indicators. It provides details on commonly used indicators such as mortality indicators (e.g. crude death rate, life expectancy), morbidity indicators, disability rates, and nutritional, health care delivery, and social/mental health indicators. It also discusses characteristics and uses of indicators and classifications such as environmental and socioeconomic indicators. Physical quality of life index is introduced as a composite index used to measure health outcomes.