An organization agrees a target for 'average response time of the order-entry transaction' but this measure is not tied to any service in the service catalogue. Why does the service level management practice warn against this?

ITIL 4 Foundation, objective 7. Seven ITIL practices in detail medium

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The options

Correct A target that does not relate to a defined service is just an individual metric with no purpose behind it

Correct. Agreements must relate to a defined service; otherwise the numbers float free of anything the customer is actually buying or the provider is actually accountable for.

Not correct Response time is a subjective measure and cannot be agreed contractually

Response time is objectively measurable. The defect described is the missing link to a defined service, not the nature of the measurement.

Not correct Only availability and capacity measures may be used as agreed service targets

There is no such restriction. Performance measures are legitimate; they simply have to hang off a defined service.

Not correct Targets of this kind belong to the business analysis practice rather than service level management

Business analysis analyses needs and recommends solutions; it does not take ownership of service targets. The issue is the missing service definition, not the owning practice.

Why

One requirement for successful SLAs is that they relate to a defined service — normally one described in the service catalogue. Without that anchor, agreed numbers are free-floating metrics: nobody can say which service is in trouble when a number is missed, and no meaningful scope of accountability exists.

Where this comes from

Cited
ITIL 4 syllabus clause 7

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