This document discusses safety performance indicators (SPIs), which are data-based metrics used to monitor and assess safety performance in areas like flight operations, maintenance, and finances. SPIs help management determine if an airline is achieving its safety objectives. Acceptable safety is defined by setting SPIs and safety performance targets. SPIs should be linked to objectives and based on available data. Management monitors SPIs and targets to identify abnormal safety changes and ensure targets are realistic and achievable. Examples provided include using customer complaints to measure satisfaction and flight delays to measure on-time performance. The process involves setting objectives, indicators, targets, and checking if targets are met, addressing issues if not. Departments must define and report their objectives,