Error(오류) = Mistake by human
Defect(결함) = Fault = Bug
↓
Failure(장애) = Defect + more = Issue = Incident
↓
Risk(리스크) = probability of failure x business impact
They all look similar, but there are the some differences as above.
Somethings are added to the 'Defect' and becomes an 'Failure'
Somethings are added to the 'Failure' and becomes a 'Risk'.
In other words, the further down the 'Risk' is, the more comprehensive it becomes.
** Source: https://myinbox.tistory.com/4
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