|Producer||Clarivate Analytics (United States)|
|Disciplines||Science, social science, arts, humanities (supports 256 disciplines)|
|Record depth||Citation indexing, author, topic title, subject keywords, abstract, periodical title, author's address, publication year|
|Format coverage||Full text articles, reviews, editorials, chronologies, abstracts, proceedings (journals and book-based ), technical papers|
|Temporal coverage||1900 to present|
|No. of records|
Web of Science (previously known as Web of Knowledge) is a website that provides subscription-based access to multiple databases that provide comprehensive citation data for many different academic disciplines. It was originally produced by the Institute for Scientific Information (ISI) and is currently maintained by Clarivate (previously the Intellectual Property and Science business of Thomson Reuters).
A citation index is built on the fact that citations in science serve as linkages between similar research items, and lead to matching or related scientific literature, such as journal articles, conference proceedings, abstracts, etc. In addition, literature which shows the greatest impact in a particular field, or more than one discipline, can be easily located through a citation index. For example, a paper's influence can be determined by linking to all the papers that have cited it. In this way, current trends, patterns, and emerging fields of research can be assessed. Eugene Garfield, the "father of citation indexing of academic literature,"who launched the Science Citation Index (SCI), which in turn led to the Web of Science, wrote:
Citations are the formal, explicit linkages between papers that have particular points in common. A citation index is built around these linkages. It lists publications that have been cited and identifies the sources of the citations. Anyone conducting a literature search can find from one to dozens of additional papers on a subject just by knowing one that has been cited. And every paper that is found provides a list of new citations with which to continue the search. The simplicity of citation indexing is one of its main strengths.
Web of Science is described as a unifying research tool which enables the user to acquire, analyze, and disseminate database information in a timely manner. This is accomplished because of the creation of a common vocabulary, called ontology, for varied search terms and varied data. Moreover, search terms generate related information across categories.
Acceptable content for Web of Science is determined by an evaluation and selection process based on the following criteria: impact, influence, timeliness, peer review, and geographic representation.
Web of Science employs various search and analysis capabilities. First, citation indexing is employed, which is enhanced by the capability to search for results across disciplines. The influence, impact, history, and methodology of an idea can be followed from its first instance, notice, or referral to the present day. This technology points to a deficiency with the keyword-only method of searching.
Second, subtle trends and patterns relevant to the literature or research of interest, become apparent. Broad trends indicate significant topics of the day, as well as the history relevant to both the work at hand, and particular areas of study.
Third, trends can be graphically represented.
Expanding the coverage of Web of Science, in November 2009 Thomson Reuters introduced Century of Social Sciences. This service contains files which trace social science research back to the beginning of the 20th century, As of 24 February 2017 [update] , the multidisciplinary coverage of the Web of Science encompasses 12,000 high impact journals and 160,000 conference proceedings. The selection is made on the basis of impact evaluations and comprise open-access journals, spanning multiple academic disciplines. The coverage includes: the sciences, social sciences, arts, and humanities, and goes across disciplines. However, Web of Science does not index all journals.and Web of Science now has indexing coverage from the year 1900 to the present.
There is a significant and positive correlation between Impact Factor and CiteScore. However, an analysis by Elsevier, who created the journal evaluation metric CiteScore, has identified 216 journals from 70 publishers to be in the top 10 percent of the most-cited journals in their subject category based on the CiteScore while they did not have Impact Factor.It appears that Impact Factor does not provide a comprehensive and an unbiased coverage of high quality journals. Similar results can be observed by comparing Impact Factor with SCImago Journal Rank.
Furthermore, as of September 3, 2014 the total file count of the Web of Science was 90 million records, which included over a billion cited references. This citation service on average indexes around 65 million items per year, and it is described as the largest accessible citation database.
Titles of foreign-language publications are translated into English and so cannot be found by searches in the original language.
In 2018, Web of Science started embedding partial information about the open access status of works, using Unpaywall data.
The Web of Science Core Collection consists of six online databases:
Since 2008, the Web of Science hosts a number of regional citation indices:
The seven citation indices listed above contain references which have been cited by other articles. One may use them to undertake cited reference search, that is, locating articles that cite an earlier, or current publication. One may search citation databases by topic, by author, by source title, and by location. Two chemistry databases, Index Chemicus and Current Chemical Reactions allow for the creation of structure drawings, thus enabling users to locate chemical compounds and reactions.
The following types of literature are indexed: scholarly books, peer reviewed journals, original research articles, reviews, editorials, chronologies, abstracts, as well as other items. Disciplines included in this index are agriculture, biological sciences, engineering, medical and life sciences, physical and chemical sciences, anthropology, law, library sciences, architecture, dance, music, film, and theater. Seven citation databases encompasses coverage of the above disciplines.
As with other scientific approaches, scientometrics and bibliometrics have their own limitations. In 2010, a criticism was voiced pointing toward certain deficiencies of the journal impact factor (JIF) calculation process, based on Thomson Reuters Web of Science, such as: journal citation distributions usually are highly skewed towards established journals; journal impact factor properties are field-specific and can be easily manipulated by editors, or even by changing the editorial policies; this makes the entire process essentially non-transparent.
Regarding the more objective journal metrics, there is a growing view that for greater accuracy it must be supplemented with article-level metrics and peer-review.Thomson Reuters replied to criticism in general terms by stating that "no one metric can fully capture the complex contributions scholars make to their disciplines, and many forms of scholarly achievement should be considered."
A citation index is a kind of bibliographic index, an index of citations between publications, allowing the user to easily establish which later documents cite which earlier documents. A form of citation index is first found in 12th-century Hebrew religious literature. Legal citation indexes are found in the 18th century and were made popular by citators such as Shepard's Citations (1873). In 1960, Eugene Garfield's Institute for Scientific Information (ISI) introduced the first citation index for papers published in academic journals, first the Science Citation Index (SCI), and later the Social Sciences Citation Index (SSCI) and the Arts and Humanities Citation Index (AHCI). The first automated citation indexing was done by CiteSeer in 1997 and was patented. Other sources for such data include Google Scholar, Elsevier's Scopus, and the National Institutes of Health's iCite.
The Institute for Scientific Information (ISI) was an academic publishing service, founded by Eugene Garfield in Philadelphia in 1956. ISI offered scientometric and bibliographic database services. Its specialty was citation indexing and analysis, a field pioneered by Garfield.
The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science. As a journal-level metric, it is frequently used as a proxy for the relative importance of a journal within its field; journals with higher impact factor values are given status of being more important, or carry more prestige in their respective fields, than those with lower values. While frequently used by universities and funding bodies to decide on promotion and research proposals, it has recently come under attack for distorting good scientific practices.
Scientometrics is the field of study which concerns itself with measuring and analysing scholarly literature. Scientometrics is a sub-field of bibliometrics. Major research issues include the measurement of the impact of research papers and academic journals, the understanding of scientific citations, and the use of such measurements in policy and management contexts. In practice there is a significant overlap between scientometrics and other scientific fields such as information systems, information science, science of science policy, sociology of science, and metascience. Critics have argued that over-reliance on scientometrics has created a system of perverse incentives, producing a publish or perish environment that leads to low quality research.
Eugene Eli Garfield was an American linguist and businessman, one of the founders of bibliometrics and scientometrics. He helped to create Current Contents, Science Citation Index (SCI), Journal Citation Reports, and Index Chemicus, among others, and founded the magazine The Scientist.
The Arts & Humanities Citation Index (A&HCI), also known as Arts & Humanities Search, is a citation index, with abstracting and indexing for more than 1,700 arts and humanities journals, and coverage of disciplines that includes social and natural science journals. Part of this database is derived from Current Contents records. Furthermore, the print counterpart is Current Contents.
Citation impact is a measure of how many times an academic journal article or book or author is cited by other articles, books or authors. Citation counts are interpreted as measures of the impact or influence of academic work and have given rise to the field of bibliometrics or scientometrics, specializing in the study of patterns of academic impact through citation analysis. The journal impact factor, the two-year average ratio of citations to articles published, is a measure of the importance of journals. It is used by academic institutions in decisions about academic tenure, promotion and hiring, and hence also used by authors in deciding which journal to publish in. Citation-like measures are also used in other fields that do ranking, such as Google's PageRank algorithm, software metrics, college and university rankings, and business performance indicators.
The h-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The h-index correlates with obvious success indicators such as winning the Nobel Prize, being accepted for research fellowships and holding positions at top universities. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications. The index has more recently been applied to the productivity and impact of a scholarly journal as well as a group of scientists, such as a department or university or country. The index was suggested in 2005 by Jorge E. Hirsch, a physicist at UC San Diego, as a tool for determining theoretical physicists' relative quality and is sometimes called the Hirsch index or Hirsch number.
Chest is a peer-reviewed medical journal covering chest diseases and related issues, including pulmonology, cardiology, thoracic surgery, transplantation, breathing, airway diseases, and emergency medicine. The journal was established in 1935. It is the official journal of the American College of Chest Physicians which publishes the journal. The editor-in-chief is Peter Mazzone.
The Science Citation Index (SCI) is a citation index originally produced by the Institute for Scientific Information (ISI) and created by Eugene Garfield. It was officially launched in 1964 and is now owned by Clarivate Analytics. The larger version covers more than 9,200 notable and significant journals, across 178 disciplines, from 1900 to the present. These are alternatively described as the world's leading journals of science and technology, because of a rigorous selection process.
Journal Citation Reports (JCR) is an annual publication by Clarivate Analytics. It has been integrated with the Web of Science and is accessed from the Web of Science-Core Collections. It provides information about academic journals in the natural sciences and social sciences, including impact factors. The JCR was originally published as a part of Science Citation Index. Currently, the JCR, as a distinct service, is based on citations compiled from the Science Citation Index Expanded and the Social Sciences Citation Index.
The British Journal of Pharmacology is a biweekly peer-reviewed medical journal covering all aspects of experimental pharmacology. It is published for the British Pharmacological Society by Wiley-Blackwell. It was established in 1946 as the British Journal of Pharmacology and Chemotherapy. The journal obtained its current title in 1968.
BIOSIS Previews is an English-language, bibliographic database service, with abstracts and citation indexing. It is part of Clarivate Analytics Web of Science suite. BIOSIS Previews indexes data from 1926 to the present.
The Materials Science Citation Index is a citation index, established in 1992, by Thomson ISI. Its overall focus is cited reference searching of the notable and significant journal literature in materials science. The database makes accessible the various properties, behaviors, and materials in the materials science discipline. This then encompasses applied physics, ceramics, composite materials, metals and metallurgy, polymer engineering, semiconductors, thin films, biomaterials, dental technology, as well as optics. The database indexes relevant materials science information from over 6,000 scientific journals that are part of the ISI database which is multidisciplinary. Author abstracts are searchable, which links articles sharing one or more bibliographic references. The database also allows a researcher to use an appropriate article as a base to search forward in time to discover more recently published articles that cite it.
The Health Education Journal is a peer-reviewed academic journal that covers the field of health education. It was established in 1943 and is published by Sage Publications The editor-in-chief is Peter Aggleton.
Methods of Information in Medicine is a peer-reviewed scientific journal covering research in medical informatics. It is an official journal of the International Medical Informatics Association, the European Federation for Medical Informatics, and the German Association for Medical Informatics, Biometry and Epidemiology. It is the oldest and longest running journal in its field.
The Journal of Neuroscience Methods is a peer-reviewed scientific journal covering scientific techniques and protocols used in any branch of neuroscience research. It was established in 1979. The editor-in-chief is Giuseppe Di Giovanni, Professor of Neuroscience at the University of Malta and Honorary Professor at Cardiff University, UK. Journal Neuroscience Methods is published 18 times a year by Elsevier.
The Emerging Sources Citation Index (ESCI) is a citation index produced since 2015 by Thomson Reuters, and now by Clarivate Analytics. According to the publisher, the index includes "peer-reviewed publications of regional importance and in emerging scientific fields".
The ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems is a peer-reviewed scientific journal established in 2014 by the American Society of Civil Engineers (ASCE) and the American Society of Mechanical Engineers (ASME). It disseminates research findings, best practices concerns, and discussions and debates on risk- and uncertainty-related issues in the areas of civil and mechanical engineering and related fields.
Clarivate is a public American company that operates a collection of subscription-based services focused largely on analytics in the areas of scientific and academic research, patent intelligence and compliance standards, pharmaceutical and biotech intelligence, trademark, and domain and brand protection. The services include Web of Science, Cortellis, CPAglobal, Derwent, Derwent World Patents Index, CompuMark, MarkMonitor, Publons, EndNote, Kopernio, and ScholarOne.