Three experiments were made by a flexible machine search system to test the retrieval efficiency of searching free text and keywords. Results based upon relevance judgements of users indicate that titles and abstracts are good index material which can be used for machine searching without human indexing. (Author/SJ)

The compatibility property of documentation system is defined by the capacity of the system to posit relationships of equivalence. This state is reached when cataloging references are properly structured and when a program allows searching the same data in the system. (15 references) (Author/MM)

Discussed is the Czechoslovak program of State Information Policy which aims at the construction of a unified, integrated national system of scientific, technological and economic information. (Author/SJ)

Reports on a series of programs that have been developed to process data bases, consisting of textual items, and to index and arrange (classify) the data items in accordance with an automatically generated classification system. (Author)