title: Barriers to evaluation of clinical vocabularies.
abstract: BACKGROUND
  The importance of standard vocabularies for representing clinical data is widely accepted. The selection of suitable vocabularies for a given task relies upon criteria for systematically differentiating vocabularies. However, methods and measures for comparing vocabularies are only now emerging. Substantial barriers inhibit progress in the development of these measures.
  
  
  METHODS
  As part of a larger project, the authors are developing quantitative measures for characteristics of controlled vocabulary as identified in the literature.
  
  
  RESULTS
  Seven barriers have been identified that inhibit the development of quantitative measures of the characteristics of controlled vocabularies: 1) application dependence; 2) empirical v. independent assessment; 3) dichotomous v. continuous measures of characteristics; 4) poor definition of characteristics; 5) number of characteristics; 6) multiple levels of significance of characteristics; and 7) interdependence of characteristics.
  
  
  CONCLUSIONS
  Progress toward quantitative assessment of clinical vocabularies is dependent upon overcoming barriers to the development of appropriate measures. Such progress requires innovative solutions and collaboration among investigators.
authors.affiliation: Division of Medical Informatics, Duke University Medical Center, Durham, North Carolina, USA. hales002@mc.duke.edu
authors.forename: J W
authors.initials: JW
authors.lastname: Hales
authors.forename: K M
authors.initials: KM
authors.lastname: Schoeffler
mesh_terms: D005069:Evaluation Studies as Topic; D006801:Humans; D011786:Quality Control; D018875:Vocabulary, Controlled