The Unified Service Management method (USM) is a universal, methodical approach for service management. The USM method provides a standardised management system for a service organisation of any size, in any line of business, to manage its people, its processes, its technology and its services, based on an explicit service-management architecture. For example, USM has been adopted as the foundation for the NORA (Dutch Government Reference Architecture) Basic Concept of Service Delivery. 

The Unified Service Management does this by explicitly specifying a service-management architecture for the service provider's management system. That management system supports the concept of "the link" for any supply chain, solving the organisational-interoperability challenge of complex service ecosystems. USM is principle-based rather than practice-based, which makes it learnable, holistic and comprehensive; the USM Wiki documents the artefacts and structure of the method. USM is owned and managed by the SURVUZ Foundation, a Dutch non-profit whose knowledge products are made available for free as much as possible.  

The USM knowledge products are made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International licence (CC BY-NC-SA 4.0).