ISO/IEC TS 33054:2020

This document defines a process reference model for the domain of service management.
The model specifies a process architecture for the domain and comprises a set of processes. Each process is described in terms of process purpose and outcomes.
The process reference model in this document is directed at assessment sponsors and competent assessors who wish to select a model, and associated documented process method, for assessment (for either capability determination or process improvement).