IT Service Management: Information from Answers.com IT Service Management (ITSM) is a discipline for managing large-scale information technology (IT) systems, philosophically centered on the customer's perspective of IT's contribution to the business. ITSM stands in deliberate contrast to technology-centered approaches to IT management and business interaction. IT Service Management IT Service Management (ITSM) is a discipline for managing large-scale information technology (IT) systems, philosophically informationmanagementreferenceservice in About Technologywith disciplineitsmmanagementservicemanagement