Level 1 is our most basic level of indexing and includes people, film and book titles, and all other proper nouns.
Level 2 locates proper nouns and uses the author’s guidelines for their related subheadings; it also draws on the author’s list of subject terms to identify subject headings and subheadings.
Level 3 analyzes the manuscript to identify all proper nouns, subject terms, and subheadings to be used in the index.