Glossary
- ODConline data collection
- OECDThe Organisation for Economic Co-operation and Development; conducts studies such as PIAAC, PISA, and TALIS
- OECSOpen-Ended Coding System
- OERSOpen-Ended Response Scoring
- OREALCOficina Regional de Educación para América Latina y el Caribe
- OSSOnline Survey System
- OTLopportunity to learn