InterPlay provides access to the locations of printed plays in collections, anthologies and periodicals at Portland State University Library. Most of the plays cited are not indexed in the standard printed play indexes such as Ottemiller's Index to Plays in Collections or H. W. Wilson's Play Index. For plays by the most familiar authors (e.g. Shakespeare), you should consult the Watzek Library catalog. InterPlay is updated frequently in order to include recent publications.