Information science

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Not to be confused with Information theory or Informing science.
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The Ancient Library of Alexandria, an early form of information storage and retrieval.

Information science (or information studies) is an interdisciplinary field primarily concerned with the analysis, collection, classification, manipulation, storage, retrieval and dissemination of information.[1] Practitioners within the field study the application and usage of knowledge in organizations, along with the interaction between people, organizations and any existing information systems, with the aim of creating, replacing, improving or understanding information systems. Information science is often (mistakenly) considered a branch of computer science. However, it is actually a broad, interdisciplinary field, incorporating not only aspects of computer science, but often diverse fields such as archival science, cognitive science, commerce, communications, law, library science, museology, management, mathematics, philosophy, public policy, and the social sciences.

Information science should not be confused with information theory, the study of a particular mathematical concept of information, or with library science, a field related to libraries which uses some of the principles of information science.

Contents

[edit] Foundations

[edit] Scope and approach

Information science focuses on understanding problems from the perspective of the stakeholders involved and then applying information and other technologies as needed. In other words, it tackles systemic problems first rather than individual pieces of technology within that system. In this respect, information science can be seen as a response to technological determinism, the belief that technology "develops by its own laws, that it realizes its own potential, limited only by the material resources available and the creativity of its developers. It must therefore be regarded as an autonomous system controlling and ultimately permeating all other subsystems of society."[2]

Many universities have entire colleges, departments or schools devoted to the study of information science, while numerous information science scholars can be found in disciplines such as communication, computer science, law, library science, and sociology. Several institutions have formed an I-School Caucus (see List of I-Schools), but there are numerous others besides these with comprehensive information foci.

Within information science, attention has been given in recent years to human–computer interaction, groupware, the semantic web, value sensitive design, iterative design processes and to the ways people generate, use and find information.

[edit] Definitions of information science

An early definition of Information science (going back to 1968, the year when American Documentation Institute shifted name to American Society for Information Science and Technology) is:

“Information science is that discipline that investigates the properties and behavior of information, the forces governing the flow of information, and the means of processing information for optimum accessibility and usability.
It is concerned with that body of knowledge relating to the origination, collection, organization, storage, retrieval, interpretation, transmission, transformation, and utilization of information. This includes the investigation of information representations in both natural and artificial systems, the use of codes for efficient message transmission, and the study of information processing devices and techniques such as computers and their programming systems. It is an interdisciplinary science derived from and related to such fields as mathematics, logic, linguistics, psychology, computer technology, operations research, the graphic arts, communications, library science, management, and other similar fields. It has both a pure science component, which inquires into the subject without regard to its application, and an applied science component, which develops services and products” (Borko, 1968, p.3).[3]

Some authors treat informatics as a synonym for information science, especially related to the concept developed by A. I. Mikhailov and other Soviet authors in the mid sixties, which suggested that informatics is a discipline related to the study of Scientific Information.[4] Because of the rapidly evolving, interdisciplinary nature of informatics, a precise meaning of the term "informatics" is presently difficult to pin down.

Regional differences and international terminology complicate the problem. Some people note that much of what is called "Informatics" today was once called "Information Science" at least in fields such as Medical Informatics. For example, when library scientists began also to use the phrase "Information Science" to refer to their work, the term informatics emerged:

  • in the United States as a response by computer scientists to distinguish their work from that of library science, and
  • in Britain as a term for a science of information that studies natural, as well as artificial or engineered, information-processing systems.

There is considerably differences between what is considered a subfield of information science and what is not (or what belongs to one information science and what belongs to another. If we take information systems as an example, Vickery (1973) is a book written by a leading information scientist and that book places information systems within IS. Ellis, Allen, & Wilson (1999) is, on the other hand a bibliometric investigation describing the relation between two different fields: "Information science" and "information systems".

[edit] A multitude of information sciences?

Michael Buckland (2011) wrote an article What Kind of Science Can Information Science Be? from the perspective of Library and information science: "other important fields [...] have also used the name “information science.” One is computer science, concerned with the theory and application of algorithms. Another, concerned with entropy, probability, Shannon-Weaver information theory, physical patterns (in-form-ing), and related topics, is sometimes referred to as the “physics of information.” Also, the word information is, of course, used in information technology (IT, also ICT, for information and communication technologies), but largely restricted in practice to the use of electronics for communication and computation. These other areas are not considered here. Instead, we are concerned with those areas generally understood as being within the scope of library and information science (LIS) and the interests of the American Society for Information Science and Technology."

[edit] Philosophy of information

Main article: Philosophy of information

Philosophy of information (PI) studies conceptual issues arising at the intersection of computer science, information technology, and philosophy. It includes the investigation of the conceptual nature and basic principles of information, including its dynamics, utilisation and sciences, as well as the elaboration and application of information-theoretic and computational methodologies to its philosophical problems.[5]

[edit] Ontology

Main article: Ontology (information science)

In computer science and information science, an ontology formally represents knowledge as a set of concepts within a domain, and the relationships between those concepts. It can be used to reason about the entities within that domain and may be used to describe the domain.

More specifically, an ontology is a model for describing the world that consists of a set of types, properties, and relationship types. Exactly what is provided around these varies, but they are the essentials of an ontology. There is also generally an expectation that there be a close resemblance between the real world and the features of the model in an ontology.[6]

In theory, an ontology is a "formal, explicit specification of a shared conceptualisation".[7] An ontology renders shared vocabulary and taxonomy which models a domain with the definition of objects and/or concepts and their properties and relations.[8]

Ontologies are the structural frameworks for organizing information and are used in artificial intelligence, the Semantic Web, systems engineering, software engineering, biomedical informatics, library science, enterprise bookmarking, and information architecture as a form of knowledge representation about the world or some part of it. The creation of domain ontologies is also fundamental to the definition and use of an enterprise architecture framework.

[edit] Careers

[edit] Information scientist

Main article: Information scientist

An information scientist is an individual, usually with a relevant subject degree or high level of subject knowledge, providing focused information to scientific and technical research staff in industry, a role quite distinct from and complementary to that of a librarian. The title also applies to an individual carrying out research in information science.

[edit] Information professional

Main article: Information professional

An information professional is an individual who preserves, organizes, and disseminates information. Information professionals are skilled in the organization and retrieval of recorded knowledge. Traditionally, their work has been with print materials, but these skills are being increasingly used with electronic, visual, audio, and digital materials. Information professionals work in a variety of public, private, non-profit, and academic institutions.

[edit] History

(See also Information history)

[edit] Early beginnings

Gottfried Wilhelm von Leibniz, a German polymath who wrote primarily in Latin and French. His fields of study were Metaphysics, Mathematics, Theodicy.

Information science, in studying the collection, classification, manipulation, storage, retrieval and dissemination of information has origins in the common stock of human knowledge. Information analysis has been carried out by scholars at least as early as the time of the Abyssinian Empire with the emergence of cultural depositories, what is today known as libraries and archives.[9] Institutionally, information science emerged in the 19th century along with many other social science disciplines. As a science, however, it finds its institutional roots in the history of science, beginning with publication of the first issues of Philosophical Transactions, generally considered the first scientific journal, in 1665 by the Royal Society (London).

The institutionalization of science occurred throughout the 18th Century. In 1731, Benjamin Franklin established the Library Company of Philadelphia, the first library owned by a group of public citizens, which quickly expanded beyond the realm of books and became a center of scientific experiment, and which hosted public exhibitions of scientific experiments.[10] Benjamin Franklin did invest a town in Massachusetts with a collection of books that the town voted to make available to all free of charge, which formed the first Public Library.[11] Academie de Chirurgia (Paris) published Memoires pour les Chirurgiens, generally considered to be the first medical journal, in 1736. The American Philosophical Society, patterned on the Royal Society (London), was founded in Philadelphia in 1743. As numerous other scientific journals and societies are founded, Alois Senefelder develops the concept of lithography for use in mass printing work in Germany in 1796.

[edit] 19th century

Joseph Marie Jacquard

By the 19th Century the first signs of information science emerged as separate and distinct from other sciences and social sciences but in conjunction with communication and computation. In 1801, Joseph Marie Jacquard invented a punched card system to control operations of the cloth weaving loom in France. It was the first use of "memory storage of patterns" system.[12] As chemistry journals emerged throughout the 1820s and 1830s,[13] Charles Babbage developed his "difference engine," the first step towards the modern computer, in 1822 and his "analytical engine” by 1834. By 1843 Richard Hoe developed the rotary press, and in 1844 Samuel Morse sent the first public telegraph message. By 1848 William F. Poole begins the Index to Periodical Literature, the first general periodical literature index in the US.

In 1854 George Boole published An Investigation into Laws of Thought..., which lays the foundations for Boolean algebra, which is later used in information retrieval.[14] In 1860 a congress was held at Karlsruhe Technische Hochschule to discuss the feasibility of establishing a systematic and rational nomenclature for chemistry. The congress did not reach any conclusive results, but several key participants returned home with Stanislao Cannizzaro's outline (1858), which ultimately convinces them of the validity of his scheme for calculating atomic weights.[15]

By 1865, the Smithsonian Institution began a catalog of current scientific papers, which became the International Catalogue of Scientific Papers in 1902.[16] The following year the Royal Society began publication of its Catalogue of Papers in London. In 1868, Christopher Sholes, Carlos Glidden, and S. W. Soule produced the first practical typewriter. By 1872 Lord Kelvin devised an analogue computer to predict the tides, and by 1875 Frank Stephen Baldwin was granted the first US patent for a practical calculating machine that performs four arithmetic functions.[13] Alexander Graham Bell and Thomas Edison invented the telephone and phonograph in 1876 and 1877 respectively, and the American Library Association was founded in Philadelphia. In 1879 Index Medicus was first issued by the Library of the Surgeon General, U.S. Army, with John Shaw Billings as librarian, and later the library issues Index Catalogue, which achieved an international reputation as the most complete catalog of medical literature.[17]

[edit] European documentation

The discipline of documentation science, which marks the earliest theoretical foundations of modern information science, emerged in the late part of the 19th Century in Europe together with several more scientific indexes whose purpose was to organize scholarly literature. Many information science historians cite Paul Otlet and Henri La Fontaine as the fathers of information science with the founding of the International Institute of Bibliography (IIB) in 1895.[18] A second generation of European Documentalists emerged after the Second World War, most notably Suzanne Briet. However, "information science" as a term is not popularly used in academia until sometime in the latter part of the 20th Century.[19]

Documentalists emphasized the utilitarian integration of technology and technique toward specific social goals. According to Ronald Day, "As an organized system of techniques and technologies, documentation was understood as a player in the historical development of global organization in modernity – indeed, a major player inasmuch as that organization was dependent on the organization and transmission of information."[20] Otlet and Lafontaine (who won the Nobel Prize in 1913) not only envisioned later technical innovations but also projected a global vision for information and information technologies that speaks directly to postwar visions of a global "information society." Otlet and Lafontaine established numerous organizations dedicated to standardization, bibliography, international associations, and consequently, international cooperation. These organizations were fundamental for ensuring international production in commerce, information, communication and modern economic development, and they later found their global form in such institutions as the League of Nations and the United Nations. Otlet designed the Universal Decimal Classification, based on Melville Dewey’s decimal classification system.[21]

Although he lived decades before computers and networks emerged, what he discussed prefigured what ultimately became the World Wide Web. His vision of a great network of knowledge focused on documents and included the notions of hyperlinks, search engines, remote access, and social networks.

Otlet not only imagined that all the world's knowledge should be interlinked and made available remotely to anyone, but he also proceeded to build a structured document collection. This collection involved standardized paper sheets and cards filed in custom-designed cabinets according to a hierarchical index (which culled information worldwide from diverse sources) and a commercial information retrieval service (which answered written requests by copying relevant information from index cards). Users of this service were even warned if their query was likely to produce more than 50 results per search.[21] By 1937 documentation had formally been institutionalized, as evidenced by the founding of the American Documentation Institute (ADI), later called the American Society for Information Science and Technology.

[edit] Transition to modern information science

Vannevar Bush, a famous information scientist, ca. 1940–1944

With the 1950s came increasing awareness of the potential of automatic devices for literature searching and information storage and retrieval. As these concepts grew in magnitude and potential, so did the variety of information science interests. By the 1960s and 70s, there was a move from batch processing to online modes, from mainframe to mini and microcomputers. Additionally, traditional boundaries among disciplines began to fade and many information science scholars joined with library programs. They further made themselves multidisciplinary by incorporating disciplines in the sciences, humanities and social sciences, as well as other professional programs, such as law and medicine in their curriculum. By the 1980s, large databases, such as Grateful Med at the National Library of Medicine, and user-oriented services such as Dialog and Compuserve, were for the first time accessible by individuals from their personal computers. The 1980s also saw the emergence of numerous special interest groups to respond to the changes. By the end of the decade, special interest groups were available involving non-print media, social sciences, energy and the environment, and community information systems. Today, information science largely examines technical bases, social consequences, and theoretical understanding of online databases, widespread use of databases in government, industry, and education, and the development of the Internet and World Wide Web.[22]

[edit] Research vectors and applications

The following areas are some of those that information science investigates and develops.

[edit] Information access

Main article: Information access

Information access is an area of research at the intersection of informatics, Information Science, Information Security, Language Technology, Computer Science, and library science.

The objectives of information access research are to automate the processing of large and unwieldy amounts of information and to simplify users' access to it.

Applicable technologies include information retrieval, text mining, machine translation, and text categorisation.

[edit] Information architecture

Main article: Information architecture

Information architecture (IA) is the art and science of organizing and labelling websites, intranets, online communities and software to support usability.[23] It is an emerging discipline and community of practice focused on bringing together principles of design and architecture to the digital landscape.[24] Typically it involves a model or concept of information which is used and applied to activities that require explicit details of complex information systems. These activities include library systems and database development.

[edit] Information management

Main article: Information management

Information management (IM) is the collection and management of information from one or more sources and the distribution of that information to one or more audiences. This sometimes involves those who have a stake in, or a right to that information. Management means the organization of and control over the structure, processing and delivery of information. Throughout the 1970s this was largely limited to files, file maintenance, and the life cycle management of paper-based files, other media and records. With the proliferation of information technology starting in the 1970s, the job of information management took on a new light, and also began to include the field of data maintenance.

[edit] Information retrieval

Main article: Information retrieval

Information retrieval (IR) is the area of study concerned with searching for documents, for information within documents, and for metadata about documents, as well as that of searching structured storage, relational databases, and the World Wide Web. Automated information retrieval systems are used to reduce what has been called "information overload". Many universities and public libraries use IR systems to provide access to books, journals and other documents. Web search engines are the most visible IR applications.

An information retrieval process begins when a user enters a query into the system. Queries are formal statements of information needs, for example search strings in web search engines. In information retrieval a query does not uniquely identify a single object in the collection. Instead, several objects may match the query, perhaps with different degrees of relevancy.

An object is an entity that is represented by information in a database. User queries are matched against the database information. Depending on the application the data objects may be, for example, text documents, images,[25] audio,[26] mind maps[27] or videos. Often the documents themselves are not kept or stored directly in the IR system, but are instead represented in the system by document surrogates or metadata.

Most IR systems compute a numeric score on how well each object in the database match the query, and rank the objects according to this value. The top ranking objects are then shown to the user. The process may then be iterated if the user wishes to refine the query.[28]

[edit] Information seeking

Main article: Information seeking

Information seeking is the process or activity of attempting to obtain information in both human and technological contexts. Information seeking is related to, but different from, information retrieval (IR).

Much library and information science (LIS) research has focused on the information-seeking practices of practitioners within various fields of professional work. Studies have been carried out into the information-seeking behaviors of librarians,[29] academics,[30] medical professionals,[31] engineers[32] and lawyers[33] (among others). Much of this research has drawn on the work done by Leckie, Pettigrew (now Fisher) and Sylvain, who in 1996 conducted an extensive review of the LIS literature (as well as the literature of other academic fields) on professionals' information seeking. The authors proposed an analytic model of professionals' information seeking behaviour, intended to be generalizable across the professions, thus providing a platform for future research in the area. The model was intended to "prompt new insights... and give rise to more refined and applicable theories of information seeking" (1996, p. 188). The model has been adapted by Wilkinson (2001) who proposes a model of the information seeking of lawyers.

[edit] Information society

Main article: Information society

An information society is a society where the creation, distribution, diffusion, use, integration and manipulation of information is a significant economic, political, and cultural activity. The aim of an information society is to gain competitive advantage internationally, through using IT in a creative and productive way. The knowledge economy is its economic counterpart, whereby wealth is created through the economic exploitation of understanding. People who have the means to partake in this form of society are sometimes called digital citizens.

Basically, an information society is the means of getting information from one place to another (Wark, 1997, p. 22). As technology has become more advanced over time so too has the way we have adapted in sharing this information with each other.

Information society theory discusses the role of information and information technology in society, the question which key concepts shall be used for characterizing contemporary society, and how to define such concepts. It has become a specific branch of contemporary sociology.

[edit] Knowledge representation and reasoning

Knowledge representation (KR) is an area of artificial intelligence research aimed at representing knowledge in symbols to facilitate inferencing from those knowledge elements, creating new elements of knowledge. The KR can be made to be independent of the underlying knowledge model or knowledge base system (KBS) such as a semantic network.[34]

Knowledge Representation (KR) research involves analysis of how to reason accurately and effectively and how best to use a set of symbols to represent a set of facts within a knowledge domain. A symbol vocabulary and a system of logic are combined to enable inferences about elements in the KR to create new KR sentences. Logic is used to supply formal semantics of how reasoning functions should be applied to the symbols in the KR system. Logic is also used to define how operators can process and reshape the knowledge. Examples of operators and operations include, negation, conjunction, adverbs, adjectives, quantifiers and modal operators. The logic is interpretation theory. These elements—symbols, operators, and interpretation theory—are what give sequences of symbols meaning within a KR.

[edit] See also

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[edit] References

  1. ^ Merriam-Webster and American Heritage Dictionary.
  2. ^ "Web Dictionary of Cybernetics and Systems: Technological Determinism". Principia Cibernetica Web. http://pespmc1.vub.ac.be/ASC/Techno_deter.html. Retrieved 2011-11-28. 
  3. ^ Borko, H. (1968). Information science: What is it? American Documentation, 19(1), 3¬5.
  4. ^ Mikhailov, A.I., Chernyl, A.I., and Gilyarevskii, R.S. (1966) "Informatika – novoe nazvanie teorii naučnoj informacii." Naučno tehničeskaja informacija, 12, pp. 35–39.
  5. ^ Luciano Floridi, "What is the Philosophy of Information?", Metaphilosophy, 2002, (33), 1/2.
  6. ^ Garshol, L. M. (2004). "Metadata? Thesauri? Taxonomies? Topic Maps! Making sense of it all". http://www.ontopia.net/topicmaps/materials/tm-vs-thesauri.html#N773. Retrieved 13 October 2008. 
  7. ^ Gruber, Thomas R. (June 1993). "A translation approach to portable ontology specifications" (PDF). Knowledge Acquisition 5 (2): 199–220. http://tomgruber.org/writing/ontolingua-kaj-1993.pdf. 
  8. ^ Arvidsson, F.; Flycht-Eriksson, A.. "Ontologies I" (PDF). http://www.ida.liu.se/~janma/SemWeb/Slides/ontologies1.pdf. Retrieved 26 November 2008. 
  9. ^ Clark, John Willis. The Care Of Books: An Essay On The Development Of Libraries And Their Fittings, From The Earliest Times To The End Of The Eighteenth Century. Cambridge: Cambridge University Press, 1901
  10. ^ Korty, Margaret Barton. "Benjamin Franklin and Eighteenth Century American Libraries." Transactions of the American Philosophical Society December vol. 55.9 (1965)
  11. ^ "Town of Franklin - History of the Franklin Public Library". Franklinma.virtualtownhall.net. 2010-06-29. http://franklinma.virtualtownhall.net/Pages/FranklinMA_Library/libraryhistory. Retrieved 2011-05-28. 
  12. ^ Reichman, F. (1961). Notched Cards. In R. Shaw (Ed.), The state of the library art (Volume 4, Part 1, pp. 11–55). New Brunswick, NJ: Rutgers, The State University, Graduate School of Library Service
  13. ^ a b Emard, J. P. (1976). An information science chronology in perspective. Bulletin of the American Society for Information Science , 2(8), 51–56
  14. ^ Smith, E. S. (1993). On the shoulders of giants: From Boole to Shannon to Taube: The origins and development of computerized information from the mid-19th century to the present. Information Technology and Libraries , 12(2), 217–226
  15. ^ Skolnik, H. (1976). Milestones in chemical information science: Award symposium on contributions of the Division of Chemical Literature (Information) to the Chemical Society. Journal of Chemical Information and Computer Science , 16(4), 187–193
  16. ^ Adkinson, B. W. (1976). Federal government’s support of information activities: A historical sketch. Bulletin of the American Society for Information Science, 2(8), 24–26
  17. ^ Schullian, D. M., & Rogers, F. B. (1958). The National Library of Medicine. I. Library Quarterly, 28(1), 1–17
  18. ^ Rayward, W. B. (1994). International federation for information and documentation. In W. A. Wiegand, & D. G. David Jr. (Eds.), The encyclopedia of library history (pp. 290–294). New York: Garland Publishing, Inc.
  19. ^ Day, Ronald. Modern Invention of Information. Carbondale, Il.: Southern Illinois University Press, 2001: 7
  20. ^ Day, Ronald. Modern Invention of Information. Carbondale, Il.: Southern Illinois University Press, 2001: 7
  21. ^ a b Day, Ronald. Modern Invention of Information. Carbondale, Il.: Southern Illinois University Press, 2001:
  22. ^ "ASIST History". Asis.org. 1968-01-01. http://www.asis.org/history.html. Retrieved 2011-05-28. 
  23. ^ ‘What is IA?’ Information Architecture Institute. IAinstitute.org
  24. ^ Morville, Peter; Rosenfeld, Louis (2006). Information Architecture for the World Wide Web. O'Reilly Media, Inc. ISBN 978-0-596-52734-1. 
  25. ^ Goodrum, Abby A. (2000). "Image Information Retrieval: An Overview of Current Research". Informing Science 3 (2). 
  26. ^ Foote, Jonathan (1999). "An overview of audio information retrieval". Multimedia Systems (Springer). 
  27. ^ Beel, Jöran; Gipp, Bela; Stiller, Jan-Olaf (2009). "Information Retrieval On Mind Maps - What Could It Be Good For?". Proceedings of the 5th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom'09). Washington, DC: IEEE. http://www.sciplore.org/publications_en.php. 
  28. ^ Frakes, William B. (1992). Information Retrieval Data Structures & Algorithms. Prentice-Hall, Inc.. ISBN 0-13-463837-9. http://www.scribd.com/doc/13742235/Information-Retrieval-Data-Structures-Algorithms-William-B-Frakes. 
  29. ^ Brown, C. M., & Ortega, L. (2007). Information seeking behaviour of physical science librarians: Does research inform practice. College & Research Libraries, 66(3), 231–247. http://crl.acrl.org/content/66/3/231.short
  30. ^ Hemminger, B. M., Lu, D., Vaughan, K. T. L., & Adams, S. J. (2007). Information seeking behaviour of academic scientists. Journal of the American Society for Information Science and Technology, 58(14), 2205–2225. http://dx.doi.org/10.1002/asi.20686
  31. ^ Davies, K., & Harrison, J. (2007). The information-seeking behaviour of doctors: A review of the evidence. Health Information & Libraries Journal 2007, 2, 78–94. http://dx.doi.org/10.1111/j.1471-1842.2007.00713.x
  32. ^ Robinson, M. A. (2010). An empirical analysis of engineers’ information behaviors. Journal of the American Society for Information Science and Technology, 61(4), 640–658. http://dx.doi.org/10.1002/asi.21290
  33. ^ Kuhlthau, C. C., & Tama, S. L. (2001). Information search process of lawyers: A call for ‘just for me’ information services. Journal of Documentation, 57(1), 25–43 http://dx.doi.org/10.1108/EUM0000000007076
  34. ^ "Knowledge representation in RDF/XML, KIF, Frame-CG and Formalized-English", Philippe Martin, Distributed System Technology Centre, QLD, Australia, July 15–19, 2002

Buckland, Michael (2011). What kind of science can information science be? Journal of the American Society for Information Science and Technology, published as early view October 2011.

Ellis, D., Allen, D. and Wilson, T. 1999. Information Science and Information Systems: Conjunct Subjects Disjunct Disciplines. JASIS 50(12):1095-1107 (see also: http://www.cais-acsi.ca/proceedings/2000/monarch_2000.pdf )

Vickery; B. C. (1973). Information Systems. London: Butterworth.

[edit] Further reading

  • Khosrow-Pour, Mehdi (2005-03-22). Encyclopedia of Information Science and Technology. Idea Group Reference. ISBN 1-59140-553-X. 

[edit] External links

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