IT Service Management

How organizations make sure their IT actually helps the people who use it: agreeing what is needed, delivering it reliably, fixing what breaks and getting better over time — explained with ITIL, the most widely used framework.

19 pages 165 glossary terms ITIL 5

How to use this topic

The first seven pages explain the ideas behind service management: what value is and who creates it, how ITIL fits its parts together, the guiding principles, the four dimensions, the lifecycle of a product or service, and continual improvement. The pages after that describe the practices you meet every day in an IT team — the service desk, incidents, problems, changes, service requests, service levels, monitoring, configuration, releases, knowledge and suppliers. The last pages cover AI and how all of this looks on the job. The technical side of monitoring, service level objectives, on-call, incident response and postmortems is covered in depth in Observability & SRE.

The pages follow ITIL (Version 5), published in early 2026. Many organizations, job descriptions and colleagues still use the terms of ITIL 4, so the pages point out where the two differ. Definitions are explained in our own words; the official ITIL books remain the reference for the exam.

Pages marked ITIL 5 cover material from the ITIL Foundation (Version 5) exam.

Learning path

  1. 01What Is IT Service Management?What IT service management is and why organizations practice it: managing digital products and services as a whole, ITIL and its versions, and related frameworks such as ISO/IEC 20000, COBIT and FitSM.BeginnerITIL 5
  2. 02Value, Products and ServicesThe core vocabulary of service management: value and how it is co-created, providers and consumers, products and services, outputs and outcomes, and how utility, warranty, experience, costs and risks decide whether something is worth it.BeginnerITIL 5
  3. 03The ITIL Value SystemHow ITIL fits everything together: opportunity and demand turned into value through guiding principles, governance, the value chain, management practices and continual improvement.BeginnerITIL 5
  4. 04The ITIL Guiding PrinciplesThe seven guiding principles that steer decisions in any situation, from focusing on value to optimizing and automating, with practical examples and how the principles work together.BeginnerITIL 5
  5. 05The Four DimensionsThe four perspectives every product and service needs — organizations and people, information and technology, partners and suppliers, value streams and processes — and the external factors that shape them.BeginnerITIL 5
  6. 06The Product and Service LifecycleThe eight activities that take a product or service from idea to support — discover, design, acquire, build, transition, operate, deliver and support — and how value streams combine them into real work.IntermediateITIL 5
  7. 07Continual ImprovementHow organizations get better in small, measured steps: the seven-step Continual Improvement Model, baselines, critical success factors and key performance indicators, and choosing metrics that drive the right behavior.BeginnerITIL 5
  8. 08The Service DeskThe single point of contact between a provider and its users: channels, support tiers, escalation, shift-left, self-service and the life of a ticket from first contact to closure.BeginnerITIL 5
  9. 09Incident ManagementRestoring normal service as quickly as possible: logging and categorizing incidents, priority from impact and urgency, escalation, major incidents, communication and the review afterward.BeginnerITIL 5
  10. 10Problem ManagementFinding and removing the causes of incidents: problems, errors and known errors, workarounds, root cause analysis techniques and the known error database.IntermediateITIL 5
  11. 11Change EnablementMaking changes safely without slowing everything down: standard, normal and emergency changes, change authorities, assessing risk, the change schedule and maintenance windows.IntermediateITIL 5
  12. 12Service Request ManagementHandling the routine things users ask for — access, equipment, information — through a service catalog, standard request models, approvals and automation.BeginnerITIL 5
  13. 13Service Level ManagementAgreeing and meeting the right level of service: service levels and SLAs, operational level agreements and underpinning contracts, measuring what users experience, and avoiding the watermelon effect.IntermediateITIL 5
  14. 14Monitoring and Event ManagementWatching services and their components so that problems are noticed before users call: types of events, thresholds, correlation, alert fatigue and how events become incidents.IntermediateITIL 5
  15. 15Configuration and Asset ManagementKnowing what you have and how it fits together: configuration items and their relationships, the configuration management database, discovery, and managing IT assets from purchase to disposal.Intermediate
  16. 16Release and Deployment ManagementGetting new and changed functionality to users: what a release is, release planning, deployment approaches, validation and testing, and backing out or rolling forward when something goes wrong.IntermediateITIL 5
  17. 17Knowledge, Supplier and Relationship ManagementThree practices that keep a provider working well with others: sharing knowledge so it can be found and trusted, managing suppliers and contracts, and building relationships with stakeholders.Intermediate
  18. 18AI in Service ManagementWhere AI helps across the product and service lifecycle and where it needs care: generative and agentic AI, the ITIL AI Capability Model, AI maturity and AI governance.IntermediateITIL 5
  19. 19ITSM in PracticeHow service management looks on the job: ITSM tools, on-call duty, working alongside DevOps, site reliability engineering, Agile and PRINCE2, useful metrics, and what changed from ITIL 4 to ITIL (Version 5).IntermediateITIL 5

IT Service Management glossary

Short definitions of the terms used in this topic. The full glossary covers every topic.