Optimize the medical research experience for your clinicians and researchers with EBSCO Discovery Service Health ― a powerful, customizable solution that combines your hospital’s entire collection, from databases to e-books, into one streamlined search experience.
Most fields of study rely on authoritative lists of domain-specific subjects, known as controlled vocabularies, curated by subject matter experts like librarians or researchers. These vocabularies, such as the prestigious ones available via PsycInfo by the American Psychological Association (APA), Cumulative Index to Nursing and Allied Health Literature (CINAHL), or Medline’s assignment of the Medical Subject Headings (MeSH), summarize content with subject tags applied by clinicians and medical experts. EBSCO Discovery Service stands out for its one-click search across various subject authorities and its linked data network, aiding users in discovering related research, authors, and institutions. This meticulous subject indexing ensures a more confident, higher quality, and targeted search experience.
EBSCO Discovery Service (EDS) is the only discovery service that leverages these prestigious controlled vocabularies in search relevancy to ensure the most relevant information is retrieved, and in query expansion where equivalent subjects and users’ natural language are mapped together. This helps researchers focus on their research and not worry about missing articles from their queries because they did not know which subject headings to use. These work together to create a highly relevant, multidisciplinary, and user-focused research journey within EDS.
Because EBSCO treats controlled vocabularies and subject indexing with a level of respect not typically found in the research discovery space, EBSCO has the most robust linked data knowledge graph of controlled vocabularies and their metadata, called the Unified Subject Index (USI), which is the main foundation of our search engine relevancy algorithm.
EBSCO Discovery Service maintains impartiality towards content providers. Search results prioritize relevance to user queries, ranking metadata in the following order of contextual significance:
Once the most relevant results are identified, it is helpful to the user to make some value judgments, which we call “value ranking.” Here are some examples of value ranking used in EDS:
EBSCO Discovery Service honors user intent by providing relevant results when a user searches for a specific subject term, publication name, database name, chemical compound or formula, term-in-time (such as from archival material), or question from the user.
EDS also helps researchers with mistyped queries through autocorrect features and autocomplete which helps users quickly find a common search string.
The Unified Subject Index (USI) contains hundreds of multidisciplinary controlled vocabularies, including many from the Unified Medical Language System (UMLS) like the Systematized Nomenclature of Medicine (SNOWMED) and the National Cancer Institute (NCI). The EDS knowledge graph is where the controlled vocabulary equivalencies are stored and maintained. Some of the data is mapped from linked data, but vocabularies not formatted as linked data and users’ natural language are mapped by EBSCO subject matter experts. All mappings are regularly reviewed for correctness, appropriateness, completeness, consistency, and timeliness.
Users’ natural language is gathered from bidirectional card sorting exercises with librarians (scientific warrant), domain subject matter experts (literarily warrant), and end-user studies (user warrant) using Institutional Review Board (IRB) ethical human study (surveys) methodologies.
An example of a subject query expansion using the USI: A search for “plastic surgery” is expanded to the following controlled vocabularies from publishers, EBSCO, National Authorities, Open Linked Data sources, and natural language:
This Plastic Surgery sub-graph is only a subset of the subjects mapped to the USI term plastic surgery. Mapping users’ natural language to subjects allows for the users’ query to be mapped to subjects that are indexed to content. This creates a bridge between the users’ query and the content that increases recall without loss of precision in search. This is important so that the guesswork is taken out of the search process and users have more access to information without the worry of using the “right” word in search.
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