12 March 2010

Glossary A


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What is ITIL?
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Absorbed Overhead Overhead which, by means of absorption rates, is included in the costs of specific products or services.  Under or over-absorbed overhead - the difference between the overhead cost incurred and overhead cost absorbed: it may be split into its two constituent parts for control purposes.
Absorption Costing An accounting practice whereby fixed and variable costs are allocated and apportioned 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 allocated.
Account Manager An IT manager whose primary function is to maintain a close relationship with individual business representatives in order to promote the services IT can offer, to ensure that IT is satisfying the business needs of the customer and to explore new services that IT might offer the customer.  Organisationally, Account Management responsibilities are often separated from Service Level Management responsibilities when individual customers receive multiple services from IT which do not have a common owner, or when Service Level Management is perceived as purely operational responsibility, without authority or responsibility for service development.
Accounting The process of accounting fully for the way the IT organisation spends its money, particularly the ability to identify costs by service, Customer and activity.
Accounting Centre A type of IT organisation that identifies the costs of providing service, and may do some budgeting.  The focus is on measuring performance and conducting investment assessment.
Action Lists A specific IT Service Continuity Management term referring to defined actions, allocated to recovery teams and individuals, within a phase of a plan.  These are supported by reference data.
Affinity / KJ Diagram (Jiro Kawakita) A special form of brainstorming used to gather large amounts of ideas, opinions or issues, group those items that are naturally related and identify for a each grouping a single concept that ties the group together.  A useful technique when chaos exists, the team is drowning in a large volume of ideas, breakthrough thinking is required or broad issues or themes must be identified.  This is a creative rather than logical process that encourages true participation because everyone's ideas find their way into the exercise.
Agreed Service Time The time during which a particular IT service is agreed to be fully available, ideally as defined in the Service Level Agreement.  Different levels of service might apply within the agreed service time, for instance the Service Desk might not be available for all the hours that users can access their services.
Agreement In ITSM terms, the use of the word 'agreement' rather than contract signifies less the legal differences between the two and more a difference in approach and style.  'Agreement' is used exclusively for an understanding, normally written, between internal parties (though it may be appended to and therefore form part of an external contract).  An agreement is likely to register an aspiration for a particular service level whereas a contract will usually record the minimum service level permissible.  The wording in a contract must represent its legally binding nature but the wording of an ITSM agreement reflects much more the nature of the (aimed for) relationship between the parties involved.  See also Contract
Alert A warning that a threshold has been reached or that a failure has occurred, or is likely to occur.  Typically propagated by a system management tool.
Alert Phase The first phase of a Business Continuity Plan in which the initial emergency procedures and damage assessments are activated.
Allies Persons or organisations joined together for a period of time for a particular purpose or mutual benefit.
Allocated Cost A cost that can be directly identified with and assigned to a particular Customer, service, activity, etc.  See also Apportioned Cost.
Analytical Modelling A software or other service component modelling technique using tools based on mathematical models.  See also Modelling.
Application Service Provider An organisation that hosts software applications on its own servers within its own facilities.  Customers access the applications via private lines or the Internet.  Also referred to as a Commercial Service Provider.
Application Sizing The process of determining the service level, resource and cost implications of any new application or any major addition or enhancement to an existing application.
Apportioned Cost A (overhead) cost that is shared by a number of Customers, services, etc. This cost must be shared out between units on an equitable basis.  See also Allocated Cost.
Assembly CI A CI comprising other CIs.  See also Component CI.
Asset Literally a valuable person or thing that is 'owned', assets will often appear on a balance sheet as items to be set against an organisation liabilities.  In ITSCM and in Security Audit and Management, an asset is thought of as an item against which threats and vulnerabilities are identified and calculated in order to carry out a risk assessment.  In this sense, it is the asset's importance in underpinning services that matters rather than its cost.
Asset Management A standard accountancy process concerned with maintaining details of assets above a certain value and their depreciation.  Asset management systems may include information on the values, current ownership and location of assets in an Asset Register but, unlike Configuration Management, will not record the relationships between assets.  IT organisations that do not have a fully fledged CMDB will probably still have one or more Asset Registers, describing, in part, the IT infrastructure
Asset Register See Asset Management.
Assurance The IT Service Continuity Management processes by which an organisation can verify the accuracy and completeness of its Business Continuity Plans.
Asynchronous / Synchronous Transfer Asynchronous in a telecommunications sense is 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 during transmission, which is normally done in blocks.  Synchronous transmission is usually more efficient than the asynchronous method.
Attribute Descriptive characteristic of a CI, such as make/model number, version number, supplier, purchase contract number, release number, data format, role or relationship, held in the CMDB.
Audit A process of inspection, correction and verification.  Apart from their obvious financial application, audits are used to check the economy, efficiency, effectiveness and equity of an activity or process and to confirm (or otherwise) that an activity is being carried out to a common standard or in accordance with recognised best practice.  In this sense, audits will recommend, rather than implement, corrective action.  See also Auditing for Compliance.
Auditing for Compliance Checking that a process is being carried out in the planned manner, i.e. in accordance with its agreed procedures.
Automatic Call Distribution Use of computing and telephony resources to direct a call to the most appropriate call handler in the shortest possible time, attempting to ensure that the caller is satisfied, that incoming call queues are managed effectively and that the call handling resources are efficiently and effectively employed.
Availability An umbrella term that includes reliability (including resilience), maintainability, serviceability and security.  A common definition of availability is 'the ability of a component or IT service (under combined aspects of its reliability, maintainability and security) to perform its required function at a stated instant or over a stated period of time'.  Service availability is sometimes expressed as an availability percentage, i.e. the proportion of time that the service is actually available for use by the customers within the agreed service time:

(Agreed Service Time - Downtime)  x 100
       Agreed Service Time

However this definition of service availability is generally considered to be archaic and immeasurable to any party's real satisfaction in a modern IT environment.  Current best practice suggests that availability should be expressed in business centric terms, focussing on the impact of unavailability on business processes.

Availability Management A Service Management process that helps to define the Customers' requirements for IT service availability, understanding the capabilities of the IT infrastructure to deliver those levels of availability, and takes action to improve availability.  Although there is a strong technical element to this process it is important that the overriding concern is to understand availability (and particularly the impact of non-availability) in business terms.
Availability Management Database A database used by Availability Management for information needed to support report generation, statistical analysis and availability forecasting.
Availability Plan A long-term plan for the improvement of IT availability within an agreed cost.

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