OCLC's WorldCat database is an essential tool for librarians around the world. If you're not a regular user of WorldCat through FirstSearch and aren't familiar with its value, then this session is for you. If you view it you will learn how to: Search for a known item (e.g., perform an author/title search); limit a search to just juvenile (or non-juvenile) material; limit a search to just fiction (or non-fiction) material; limit a search by document type; identify nearby libraries that own items of interest; search for books on a particular topic (e.g., perform a subject search). Special emphasis will be placed on using WorldCat to identify items to purchase or request through interlibrary loan to meet patrons' information needs.