The ProQuest Thesaurus is used to index the ABI/INFORM subject field. The thesaurus allows you to find subject terms to narrow or broaden your search. To use the thesaurus, select the thesaurus link from the Advanced Search, then browse or search for subjects containing the word or beginning with the word. Mark the items that you would like to search and then select the appropriate Boolean operator to combine your items. Click the Add to search button and your terms will be placed into the search form. From there, run your search to include the subject terms (adding additional search fields and terms if needed).