During... ten years the C.R.G. has met nearly every month, and although it has never had more than about a dozen active members, its influence has gr… - Douglas John Foskett

After a great deal of (quite valuable) discussion, the British accepted that ‘facet analysis’ must be the basis of a classification scheme able to meet the modern requirements.

The 1950s to early 1960s saw the publication of three major works on indexing, which between them span the retrieval problems of the whole spectrum of knowledge... The first was Vickery’s Classification and indexing in science (1958), followed by Foskett’s Classification and indexing in the social sciences (1963) and finally Langridge’s Classification and indexing in the humanities (1976). These three works, though designed principally as textbooks, expound many universal principles as well as highlighting the specific problems that the various groups of disciplines present and the solutions that have been adopted.

Douglas developed a strong interest in the relations between education and classification. He explored the writings of L.S Vygotsky, L. von Bertalanffy (for systems theory), and J.K. Feibleman and wrote a number of articles on classification and integrative levels.