The document discusses using the UN/CEFACT Modeling Methodology (UMM) in large e-health projects. UMM models business services and transactions between partners through various views including the business domain, requirements, transactions, and services views. The document describes applying UMM to model a simple e-health business process for a project integrating several systems and technologies to support independent living. UMM was chosen due to its use in B2B applications, manageable learning curve, and available modeling tools.