Occurrence Validation Study Group (OVSG)

The OVSG was formerly known as the Safety Indicators Study Group (SISG) that was established in 2001. 
Using the ICAO accident/incident data reporting (ADREP) taxonomy, the OVSG reviews and validates the ADREP reports submitted by States in accordance with the reporting requirements in Annex 13 — Aircraft Accident and Incident Investigation. 

The work of the group is focusing on commercial air transport to produce an agreed dataset of global accidents and serious incidents with validity, reliability and quality.