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Glossary of IT Infrastructure Library Terms (ITIL®)

Glossary of Terms for the IT Infrastructure Library
Mar 4, 2004

ITSM Watch Staff




absorbed overhead
Overhead which, by means of absorption rates, is included in costs of specific products or saleable services, in a given period of time. Under- or over-absorbed overhead: the difference between overhead cost incurred and overhead cost absorbed: it may be split into its two constituent parts for control purposes.


absorption costing
A principle whereby fixed as well as variable costs are allotted to cost units and total overheads are absorbed according to activity level. The term may be applied where production costs only, or costs of all functions are so allotted.


action lists
Defined actions, allocated to recovery teams and individuals, within a phase of a plan. These are supported by reference data.


Warning that an incident has occurred.


alert phase
The first phase of a Business Continuity Plan in which initial emergency procedures and damage assessments are activated.


allocated cost
A cost that can be directly identified with a business unit.


application portfolio
An information system containing key attributes of applications deployed in a company. Application portfolios are used as tools to manage the business value of an application throughout its lifecycle.


apportioned cost
A cost that is shared by a number of business units (an indirect cost). This cost must be shared out between these units on an equitable basis.


Component of a business process. Assets can include people, accommodation, computer systems, networks, paper records, fax machines, etc.


In a communications sense, the ability to transmit each character as a self-contained unit of information, without additional timing information. This method of transmitting data is sometimes called start/stop. Synchronous working involves the use of timing information to allow transmission of data, which is normally done in blocks. Synchronous transmission is usually more efficient than the asynchronous method.


Ability of a component or service to perform its required function at a stated instant or over a stated period of time. It is usually expressed as the availability ratio, i.e., the proportion of time that the service is actually available for use by the customers within the agreed service hours.