Learn in the textbookFundamentals of Service Management and Service Level Management
DefinitionAn SLO (service level objective, サービスレベル目標) is a concrete target value set for each service level item, which the provider aims to achieve.
ExplanationExamples are "monthly availability of 99.9% or higher" and "screen response within 2 seconds", written as numbers that show clearly whether they were met. The level agreed in an SLA is expressed by building up these item-by-item target values.
AnalogyIt is the target time you set before running a marathon.
Memory hookThe final O stands for Objective, the target you aim at.