Wilson (1972) distinguished between the top-down ìuniverse of knowledgeî
bibliographic classifications devised before the mid-twentieth century and the bottom-up
ìuniverse of conceptsî bibliographic classifications that followed from the work of Ranganathan
and the CRG in England. One aspect of this change can be detected in the change in the title of
SC from Subject Classification, with Tables, Indexes, etc., for the Subdivision of Subjects in the
second edition (1914) to Subject Classification for the Arrangement of Libraries and the
Organization of Information, with Tables, Indexes, etc., for the Subdivision of Subjects in the
third edition (1939). Thus, the concept of the organization of information was added to the
concept of arranging books in a library during the same period in which universe of concepts
bibliographic classifications were starting to replace universe of knowledge bibliographic
classifications. It is interesting, then, to trace briefly the history of differing opinions of SC
through this process of change in classificatory thinking during the first part of the twentieth
century. This section uses the work of two commentators on SC to exemplify this change. The
first commentator whose work is regarded in this way is W.C. Berwick Sayers (1881-1960) and
the second is Jack Mills (1918- ).
Wilson (1972) distinguished between the top-down ìuniverse of knowledgeî
bibliographic classifications devised before the mid-twentieth century and the bottom-up
ìuniverse of conceptsî bibliographic classifications that followed from the work of Ranganathan
and the CRG in England. One aspect of this change can be detected in the change in the title of
SC from Subject Classification, with Tables, Indexes, etc., for the Subdivision of Subjects in the
second edition (1914) to Subject Classification for the Arrangement of Libraries and the
Organization of Information, with Tables, Indexes, etc., for the Subdivision of Subjects in the
third edition (1939). Thus, the concept of the organization of information was added to the
concept of arranging books in a library during the same period in which universe of concepts
bibliographic classifications were starting to replace universe of knowledge bibliographic
classifications. It is interesting, then, to trace briefly the history of differing opinions of SC
through this process of change in classificatory thinking during the first part of the twentieth
century. This section uses the work of two commentators on SC to exemplify this change. The
first commentator whose work is regarded in this way is W.C. Berwick Sayers (1881-1960) and
the second is Jack Mills (1918- ).
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