Today's world demands an expansive search environment. The universe of information resources is immense and is growing rapidly. The content needed for research and scholarship is dispersed among publishers, aggregators, repositories, library catalogs, e-print servers, and servers throughout the Web. Users do not want to jump from one interface to another as they search for information. They prefer a single access point that takes them to all the resources in their area. Metasearch the ability to search multiple resources simultaneously is an essential component of a successful information seeking environment.