This survey of current work on data base systems is divided into three main sectors: data models, data languages, and support for data base operations, including hardware for content addressing, data base machines, and software techniques for optimizing and evaluating group expressions. A 203-item bibliography is provided. (Author/JD)

Describes the organization of the House of Commons Library which provides information, documentation, and research services to its members and outlines the history of the Parliamentary On-Line Information System (POLIS). The physical description of POLIS, indexing practices, users, and the Library's subject thesaurus are discussed. Eight…