CDS/ISIS is a menu driven generalized information Storage and Retrieval system designed specifically for computerized management of structured non-numerical data bases. One of the major advantages offered by the generalized design of the system is that CDS/ISIS is able to manipulate an unlimited number of data bases each of which may consist of completely different data elements. The CDS/ISIS user is therefore freed from the expensive taskof having to design and write computer programs each time a new product requires the use of information retrieval techniques