In 2007, the subject and genre/format vocabularies, previously maintained separately, were merged into a single list and migrated to new software, MultiTes. Although the thesaurus content remains essentially the same, there are some minor changes in field structure and labeling. For example, Public Note is now called Scope Note. Additionally, new fields were added to clarify term usage. For further information on these changes see "Fields in Term Record Displays" (via PPOC - About the Thesaurus).