Share of new incidents correctly matched to an existing Runbook Entry rather than re-diagnosed from scratch.
Incidents matched to a prior resolution ÷ total incidents with a genuine prior match available × 100
SCN-107's own worked example: one match out of one genuine opportunity
https://library.serviceinnovation.org/KCS/KCS_v6/Measurement_Matters_v6/99_Glossary_of_Measurements