ITIL service warranty and service utility

Trying to understand the different between service warranty and service utility.

From what I have learnt service warranty + service utility = service value

Im watching an ITIL video and which states on two different occasions that service warranty
means fit for purpose and then in another part of the video it states service utility also mean
fit for purpose. Whats the point of having two different terms which mean the same thing.

Is ITIL just confusing or is it my lack of understanding? So many terms seems to mean the same thing!
Ikky786Asked:
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nickg5Connect With a Mentor Commented:
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”).

.............to summarize, service utility is "what is done" and, service warranty is "how it is done"

http://itilblues.wordpress.com/2007/12/14/itil-v3-utility-and-warranty-two-sides-of-the-same-coin/
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