The Technical Documentation contains detailed information on how Education & Skills Online was developed, the workflow of the assessment, and the score reports.
Technical Documentation Chapters 1-8
Appendix C - Data Download Fields
Appendix D - Reading Components Scoring Thresholds
Appendix E - ISCO-08 Codes and Professions (Czech, English, French, Italian, Japanese, Spanish-Spain, Spanish-US)
Appendix F – ISCO-08 Codes and Professions (Estonian, Russian-Estonia, Russian-Russia, Slovak, Slovenian, and Spanish-Chile)