Definitions
The ITIL concept of change management includes developing business justification. This is a broadening of scope from other concepts of change management, and overlaps into the concerns of IT portfolio management and those areas covered by the initiation phases within programme management and project management.
For example, the IBM "Yellow Book" conception of change control (as a subset of resource control) was strictly concerned with the transfer of deliverables from projects into production. Similarly, Schiesser in IT Systems Management defines Change Management as "a process to control and coordinate all changes to an IT production environment."
Read more about this topic: Change Management (ITSM)
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