Learn in the textbookOptions for Risk Treatment
DefinitionRisk retention (リスク保有) is a treatment that takes no further measures against an evaluated risk and simply keeps it; it is also called risk acceptance (リスク受容).
ExplanationIt suits risks that are unlikely to occur or would cause little damage if they did. It is also considered when the cost of countermeasures would exceed the expected loss. Unlike leaving a risk alone without noticing it, it is a decision made as the result of evaluation.
AnalogyIt is like deciding not to bother writing your name on a cheap plastic umbrella, since you can just buy another if you lose it.
Memory hook“Retention” means holding on, and “acceptance” means taking it in. Both point toward not letting go, so remember them as two names for the same treatment.