"The thesaurus has been developed specifically for our collection. The Powerhouse collection covers a wide variety of subject areas and many different types of objects are included. There are approximately 8,600 terms. But we do not claim to have a comprehensive list of all objects and we are actively seeking contributions to broaden the appeal of the thesaurus. We have recently added a number of new terms at the request of the National Museum of Australia, and we continue to work with them in developing the thesaurus.