Learn in the textbookThe 7 Elements of Information Security
DefinitionReliability (信頼性) is the property that a system works as intended and gives consistent results every time under the same conditions.
ExplanationReliability means processing results do not conflict and malfunctions caused by defects are rare. Reducing defects in advance through thorough testing is one way to raise it.
AnalogyLike an alarm clock that rings at the same time every morning. A clock that sometimes rings and sometimes does not cannot be relied on, even if it sits within reach.
Memory hookReliability comes from rely (to depend on).