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2. The actions or intended purpose of a person, team or thing in a specific role. Service Management functions may be considered as key business activities, often with a broad scope and associated with a particular job, consisting of a collection of lower level activities. The characteristics of a function are that it is continuous and represents a defining aspect of the business enterprise. It is usually associated with more than one method and contributes to the execution of those processes. Rarely do (or should) functions mirror the organisational structure.
(Source: ENISA - the European Network and Information Security Agency. BCM & Resilience Glossary)