A model which relates the access control and indexing functions. The model is based on concept protection which allows a practically unbounded number of levels (subsets) of protection without requiring a fixed hierarchy among the levels. This protection is offered independently for each of the user operations allowed. (Author)

The paper reports on a series of programs that have been developed at the Moore School to process data-bases, consisting of textual items, and to index and arrange the data items in accordance with an automatically generated classification system. The programs produce the directories and the rearranged data-base on microfilm, where it may be…

An evaluation of graph theoretical clusters of index terms which can be extracted from an automatically indexed document collection, and the effects of employing such clusters in automatic document retrieval are described. (19 references) (Author)

The 15-year history of the development of library automation is traced, and four major obstacles which had to be overcome are identified: the lack of funds for development, programing, and testing; the need for a common data base; the need for cooperative arrangements among institutions; and the need for widely-available on-line processing. Seven…

A descriptive model of the Fire Education Resources Information System (FERIS) is examined in this document. Information regarding educational materials relating to fire prevention, protection, and suppression is discussed. A description of the model is presented in two sections. Section 1, Problem Definition, surveys the background and needs for…