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2. Any deliberate action that alters the form, fit or function of key business activities - typically, an addition, modification, movement or deletion that impacts on the IS infrastructure.
(Source: ENISA - the European Network and Information Security Agency. BCM & Resilience Glossary)
3. The addition, modification or removal of approved, supported or baselined hardware, network, software, application, environment, system, desktop build or associated documentation. (Source: OGC, Information Technology Infrastructure Library (ITIL) v3)