Integration of health information systems (HIS) in developing countries has received a great deal of attention over the last ten years. Most academic writing on this subject has been concerned with the integration of health data between different health programs. There has been little academic writing on the subject of medical commodity supply chains and logistics management information systems (LMIS) using an information systems perspective, although supply chain and logistics data are part of the HIS. Most writing on commodity supply chains and LMIS in developing countries has been done by international organisations. The plethora of information systems used in the medical commodity supply chain and the diffuse boundaries of the supply chain results in these organisations having slightly differing perspectives of what an LMIS is. Furthermore, as there are similar issues in the medical commodity supply chains of developing countries this thesis tries to answer the research question of, which architectural patterns emerge in the medical commodity supply chains in Tanzania and Uganda? Through a collective case study of these two countries, categorising the technology and software identified in the supply chain, and applying theory on evolving Information Infrastructures (II) to the LMIS's five architectural patterns were identified.