ITIL Glossary/ ITIL Terms D

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ITIL Glossary
ITIL Glossary:

All terms related to ITIL (ITIL 4, ITIL 2011, ITIL V3 & V2) and ITSM (IT Service Management)
ITIL Glossary Terms

The ITIL glossary provides you with definitions for the most important glossary terms and acronyms on the IT Infrastructure Library ITIL® (ITIL 4, ITIL 2011, ITIL V3 & V2) and ITSM (IT Service Management) in alphabetical order.[1]

Look up all terms or browse alphabetically:

1 ... 9



ITIL Terms starting with D

For quick access, all ITIL terms and definitions starting with "D" are listed below.

Please click on one of the terms to see its definition.




Data for Project Plan Update

Definition of Improvement Initiatives

Definitive Media Library (DML)

  • The Definitive Media Library (DML) is the secure logical library in which the definitive authorized versions of all media CIs are stored and protected.
  • The DML typically consists of one or more software file-storage areas, as well as physical stores holding, for example, master copies on CD/DVD.
  • → ITIL processes, ITIL Service Transition > Service Asset and Configuration Management

Definitive Software Library (DSL)

  • One or more locations in which the definitive and approved versions of all software Configuration Items are securely stored.
  • The DSL may also contain associated CIs such as licenses and documentation.
  • The DSL is a single logical storage area even if there are multiple locations.
  • All software in the DSL is under the control of Change and Release Management and is recorded in the CMDB.
  • Only software from the DSL is acceptable for use in a Release.
  • Definitive Media Library (DML) - ITIL V3
  • → ITIL processes, Configuration Management - ITIL V2

Demand Management

Demand Manager

  • → Roles within ITIL, Demand Manager
  • The role Demand Manager has been introduced in ITIL 2011 to perform the activities in the Demand Management process.
  • The Demand Manager is responsible for understanding, anticipating and influencing customer demand for services.
  • The Demand Manager works with capacity management to ensure that the service provider has sufficient capacity to meet the required demand.

Design Coordination

Desired Service Outcomes

  • The desired outcomes of a service, stated in the language of the customer.
  • Based on this information, more detailed documents are created to specify the requirements in the service provider's language.
  • → ITIL processes, ITIL Service Strategy > Business Relationship Management

Development/ Installation QA Documentation

  • A documentation of tests and quality assurance measures applied during the development or installation of applications, systems and other infrastructure components (e.g. component tests, code walk-throughs, ...).
  • A complete Development/ Installation QA Documentation testifies that the required QA measures were applied prior to handing a Release component over to Release Management.
  • → ITIL processes, ITIL Service Transition > Service Validation and Testing

Development Work Order

Disaster Practice

Disaster Recovery Invocation Guideline


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[1] ITIL® is a Registered Trade Mark of the Cabinet Office in the United Kingdom and other countries. — IT Infrastructure Library® is a Registered Trade Mark of the Cabinet Office in the United Kingdom and other countries.
Source (partially): ITIL Glossaries/ Acronyms © Crown copyright. All rights reserved. Material is reproduced with the permission of the Cabinet Office under delegated authority from the Controller of HMSO. — The complete ITIL Glossary compiled by APMG in conjunction with the Cabinet Office and TSO is available for download from the Internet.

By:  Stefan Kempter Author: Stefan Kempter, IT Process Maps GbR  and  Andrea Kempter Contributor: Andrea Kempter, IT Process Maps GbR, IT Process Maps.