This report provides an overview of the O*NET 4.0 content model and database. In addition to the overview, two useful tables are provided. Appendix B lists all of the elements in the O*NET Content Model and indicates in which database version — 3.1, 4.0, or 5.1 — where ratings will be available. Appendix C list the elements in O*NET 4.0 for which no data currently exists, but that will exist in O*NET 5.1 and subsequent versions.
