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ITIL Knowledgebase

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TCO Total Cost of Ownership
A methodology used to help make investment decisions. TCO assesses the full Lifecycle Cost of owning a Configuration Item, not just the initial Cost or purchase price.
TCU Total Cost of Utilization
A methodology used to help make investment and Service Sourcing decisions. TCU assesses the full Lifecycle Cost to the Customer of using an IT Service.
TO Technical Observation
A technique used in Service Improvement, Problem investigation and Availability Management.
Technical support staff meet to monitor the behaviour and Performance of an IT Service and make recommendations for improvement.
TOR Terms of Reference
A Document specifying the Requirements, Scope, Deliverables, Resources and schedule for a Project or Activity.
TQM Total Quality Management
A methodology for managing continual Improvement by using a Quality Management System.
TQM establishes a Culture involving all people in the Organisation in a Process of continual monitoring and improvement.
Tension Metrics A set of related Metrics, in which improvements to one Metric have a negative effect on another.
Tension Metrics are designed to ensure that an appropriate balance is achieved.
Test Environment A controlled Environment used to Test Configuration Items, Builds, IT Services, Processes etc.
Timescales ITIL promotes the philosophy of Continual Improvement so commitment to implementing ITIL in your organisation will be on-going.
However, the creation and embedding of an ITIL-aligned Service Desk, for example, can be achieved in a matter of weeks.
Trade Mark ITIL® is a Registered Trade Mark, and a Registered Community Trade Mark of the Office of Government Commerce, and is Registered in the U.S. Patent and Trademark Office.
IT Infrastructure Library ® is a Registered Trade Mark of the Central Computer and Telecommunications Agency which is now part of the Office of Government Commerce.
Transition Service Transition provides guidance on managing change along with risk and quality whilst ensuring IT Operations can manage those changes within the context of the ICT Infrastructure.
Trend Analysis Analysis of data to identify time related patterns.
Trend Analysis is used in Problem Management to identify common Failures or fragile Configuration Items, and in Capacity Management as a Modelling tool to predict future behaviour.

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