Disciplines vary between well-established ones in almost all universities with well-defined rosters of journals and conferences and nascent ones supported by only a few universities and publications. A discipline may have branches, which are often called sub-disciplines.
The following outline provides an overview of and topical guide to academic disciplines. In each case, an entry at the highest level of the hierarchy (e.g., Humanities) is a group of broadly similar disciplines; an entry at the next highest level (e.g., Music) is a discipline having some degree of autonomy and being the fundamental identity felt by its scholars. Lower levels of the hierarchy are sub-disciplines that do generally not have any role in the structure of the university's governance.
Classification of Instructional Programs (CIP 2000): Developed by the U.S. Department of Education's National Center for Education Statistics to provide a taxonomic scheme that will support the accurate tracking, assessment, and reporting of fields of study and program completions activity.