In order to compare the value of subject descriptors and title keywords as entries to subject searches, two studies were carried out. Both studies concentrated on monographs in the humanities and social sciences, held by the online public access catalogue of the National Library of the Netherlands. In the first study, a comparison was made by subject librarians between the subject descriptors and the title keywords of 475 records. They could express their opinion on a scale from 1 (descriptor is exactly or almost the same as word in title) to 7 (descriptor does not appear in title at all). It was concluded that 37 per cent of the records are considerably enhanced by a subject descriptor, and 49 per cent slightly or considerably enhanced. In the second study, subject librarians performed subject searches using title keywords and subject descriptors on the same topic. The relative recall amounted to 48 per cent and 86 per cent respectively. Failure analysis revealed the reasons why so many records that were found by subject descriptors were not found by title keywords. First, although completely meaningless titles hardly ever appear, the title of a publication does not always offer sufficient clues for title keyword searching. In those cases, descriptors may enhance the record of a publication. A second and even more important task of subject descriptors is controlling the vocabulary. Many relevant titles cannot be retrieved by title keyword searching because of the wide diversity of ways of expressing a topic. Descriptors take away the burden of vocabulary control from the user.
[1]
Martin Kurth,et al.
Controlled and Uncontrolled Vocabulary Subject Searching in an Academic Library Online Catalog.
,
1991
.
[2]
Jennifer E. Rowley,et al.
The controlled versus natural indexing languages debate revisited: a perspective on information retrieval practice and research
,
1994,
J. Inf. Sci..
[3]
Amanda Spink,et al.
Interaction in information retrieval: selection and effectiveness of search terms
,
1997
.
[4]
F. W. Lancaster,et al.
Identifying Barriers to Effective Subject Access in Library Catalogs
,
1991
.
[5]
C. P. R. Dubois,et al.
Free text vs. controlled vocabulary; a reassessment
,
1987
.
[6]
Arlene G. Taylor.
On the subject of subjects
,
1995
.
[7]
Rolf G. Henzler,et al.
Free or controlled vocabularies
,
1978
.
[8]
M. E. Maron,et al.
An evaluation of retrieval effectiveness for a full-text document-retrieval system
,
1985,
CACM.