This document provides an introduction to the Integrated Management of Childhood Illness (IMCNI) strategy. The objectives of IMCNI case management are to improve quality of care for children under five and reduce childhood mortality. IMCNI takes an integrated approach by addressing the overlapping signs and symptoms of multiple diseases threatening child health, including pneumonia, diarrhea, measles, malaria, malnutrition and HIV/AIDS. The strategy combines treatment and prevention of major childhood illnesses with aspects of nutrition, immunization and important community practices to improve child growth, development and survival.