A metric that measures the average time between incidents that cause an IT service to become unavailable, indicating how rarely service interruptions occur. A higher MTBSI means fewer incidents and a more stable service. Reducing the frequency of failures—for example through network redundancy—improves MTBSI.

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• 2023r05 #46IT サービスに関する指標には、IT サービスが利用できなくなるインシデントの発生間隔の平均時間である MTBSI（Mean Time Between Serv…