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Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2011.Cataloged from PDF version of thesis.Includes bibliographical references (p. [41]-[42]).Introduction: Partners In Health (PIH) is an international, non-profit healthcare organization with operations in several countries on multiple continents. PIH focuses on providing healthcare treatment to people living in some of the poorest places in the world, and has been operating in Haiti since 1985. At that time, PIH established a small community clinic in the central Haiti village of Cange. Today that facility has grown to become an entire medical complex, featuring a 104-bed, full-service hospital with two operating rooms, adult and pediatric wards, and clinics treating a variety of diseases and issues, from women's health to infectious diseases. In addition, Zamni Lasante ("Partners In Health" in Haitian Creyeol) has also expanded its operations to 11 other sites across Haiti's Central Plateau and beyond (Figure 1). Today, ZL ranks as one of the largest nongovernmental health care providers in Haiti - serving a catchment area of 1.2 million across the Central Plateau and the Lower Artibonite. ZL employs over 4,000 people, almost all of them Haitians, including doctors, nurses and community health workers (Zamni Lasante/ Haiti). From its beginnings 25 years ago, PIH/ZL has grown tremendously, and recent years have been no exception. Since 2004, patient encounters have increased almost threefold, from 0.9 million to 2.6 million, and the number of clinical sites has almost doubled. This growth has corresponded to an increase in drugs and supplies. In 2006, approximately 1000 m3 of drugs and supplies were moved through the system. Only two years later, in 2008, that number had more than doubled to 2200 m3 . This significant increase has greatly strained the underlying supply chain.