Read this Wikipedia article we found:
IT service management or IT service support management (ITSM or ITSSM) refers to the implementation and management of quality information technologyservices. IT service management is performed by IT service providers through people, process and information technology.[1] The following represents a characteristic statement from the ITSM literature:
Providers of IT services can no longer afford to focus on technology and their internal organization[;] they now have to consider the quality of the services they provide and focus on the relationship with customers.[2]
ITSM is process-focused and has ties and common interests with process improvement frameworks and methodologies (e.g., TQM, Six Sigma, business process management, CMMI). The discipline is not concerned with the details of how to use a particular vendor's product, or necessarily with the technical details of the systems under management. Instead, it focuses upon providing a framework to structure IT-related activities and the interactions of IT technical personnel with business customers and users.
IT service management in the broader sense overlaps with the disciplines of business service management and IT portfolio management, especially in the area of IT planning and financial control. ITSM is generally concerned with the "back office" or operational concerns of information technology management (sometimes known as operations architecture), and not with technology development. In this respect, ITSM may be seen as analogous to an enterprise resource planning (ERP) discipline for IT.
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