How is an incident defined in ITIL?

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

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The options

Not correct A cause, or potential cause, of one or more incidents

That is the definition of a problem. A problem is the underlying condition; an incident is the visible loss of service the condition produces.

Correct An unplanned interruption to a service, or a reduction in the quality of a service

Correct. Note the second half: full outage is not required. A service that still runs but has degraded below its agreed quality is already an incident.

Not correct A request from a user that initiates a service action agreed as a normal part of service delivery

That is a service request. Nothing has failed; the user is asking for something the provider has already agreed to supply routinely.

Not correct The addition, modification, or removal of anything that could have a direct effect on services

That is the definition of a change. Changes are planned interventions, whereas an incident is by definition unplanned.

Why

The definition has two limbs — unplanned interruption and reduction in quality — and the second is the one candidates forget. A slow but functioning service that breaches its agreed performance is an incident, not merely a complaint.

Where this comes from

Cited
ITIL 4 syllabus clause 7

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