Utility and Warranty come handy when characterizing and checking the value of a IT Service as it progresses throughout its lifecycle.
Utility – Functionality offered by a Product or a Service to meet a particular need. Utility is often summarized as “what it does”.
Warranty – A promise or guarantee that a Product or a Service will meet its agreed requirements (“how it is done”).
Service Modeling Language may be the “missing link” for closing the gap between Services and the underlying IT infrastructure.
Service Modeling Language (SML) is a XML-based specification that tackles the difficult task of consistently representing how computer networks, applications, servers and other IT resources are described or modeled so businesses can more easily manage the services that are built on these resources.
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ITIL Blues 