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A rule‐governed derivation of an indexing phrase from the text of a document is, in Wittgenstein's sense, a practice, rather than a mental operation explained by reference to internally represented and tacitly known rules. Some mentalistic proposals for theory in information retrieval are criticised in light of Wittgenstein's remarks on following a rule. The conception of rules as practices shifts the theoretical significance of the social role of retrieval practices from the margins to the centre of enquiry into foundations of information retrieval. The abstracted notion of a cognitive act of ‘information processing’ deflects attention from fruitful directions of research.

The purpose of this paper is to clarify the ontological and epistemological basis of classification.

Attention is drawn to a 1785 article on abstraction by Thomas Reid and the contents and theories of the article are explained. The Reid article both provides a sound approach to classification and is interesting historically as it influenced the classification pioneer Charles Ammi Cutter who, in turn, is responsible for much of the modern theory of functional bibliography. Reid's account is supplemented by brief descriptions of fallibilism and fuzziness. An associated view, Aristotelian essentialism is explained and criticized. Some observations are offered on the role of prototypes in classification and on the monothetic‐polythetic distinction.

Reid's theories, suitably embedded in fallibilism and augmented with a respect for truth, provide a sound ontological and epistemological basis for classification.

Reid's essay, together with an appreciation of fallibility and determinate and indeterminate properties, amount to a good basic theoretical foundation for cataloging.

Recently there has been much discussion of the relevance to sociology of Wittgenstein's philosophy. In this discussion, reference has been made to Wittgenstein's remarks on classification. For instance, Dutton writes “After Wittgenstein, we might say that the category of acts which may be labelled criminal (or deviant) is the category: “any” acts”. (Ditton, 1979, p. 20). According to Hughes, “Wittgenstein uses the term “family resemblances” to make the point that states of affairs falling under a common term, such as ‘games’ show overlapping similarities and resemblances rather than universal, finitely specifiable common properties”. (1977, p. 72). However, the philosophical importance of Wittgenstein's remarks and their relevance to the concerns of the sociologist have not been fully explored. What precisely is Wittgenstein thought to be asserting and denying with his observations about games? After all, on the face of it, it hardly seems controversial or interesting to say that games resemble each other. It has been argued, most notably by Bambrough, that Wittgenstein's remarks are directed towards “the problem of universals”.

This paper seeks to outline the central role of concepts in the knowledge universe, and the intertwining roles of works, instantiations, and documents. In particular the authors are interested in ontological and epistemological aspects of concepts and in the question to which extent there is a need for natural languages to link concepts to create meaningful patterns.

The authors describe the quest for the smallest elements of knowledge from a historical perspective. They focus on the metaphor of the universe of knowledge and its impact on classification and retrieval of concepts. They outline the major components of an elementary theory of knowledge interaction.

The paper outlines the major components of an elementary theory of knowledge interaction that is based on the structure of knowledge rather than on the content of documents, in which semantics becomes not a matter of synonymous concepts, but rather of coordinating knowledge structures. The evidence is derived from existing empirical research.

The paper shifts the bases for knowledge organization from a search for a universal order to an understanding of a universal structure within which many context‐dependent orders are possible.

In this monograph the author discusses the problems in constructing a logical and ethical‐empirical foundation so that relevant social values may be studied by the scientific method. Part One is concerned with the difficulties posed by the prevailing methodology. Part Two presents a new research programme based on the simultaneous equilibrium versus disequilibrium approach in conjunction with Wittgenstein's logic and the current research in ethics.

The economic science is again in a crisis and a new solution prolegomena to any future study in economics, finance and other social sciences has just been published by the International Institute of Social Economics in care of the MCB University Press in England. The roots of the major financial and economic problems of our time lie in an open conflict between theory and practice. In the 1930s and before the conflict was between classical theory and given realities. In the 1990s the conflict appears between the now prevailing modern, Keynesian theory and the actual realities. In addition during the twentieth century a great argument developed between the two schools of thought, argument which is not yet settled. In one sentence, the prolegomena tried and was successful to solve the conflict between theory and practice and the big doctrinal dispute of the twentieth century. It was a struggle of research and observation over half a century between 1947 and 1997.

This article is a contribution to the development of a comprehensive interdisciplinary theory of LIS in the hope of giving a more precise evaluation of its current problems. The article describes an interdisciplinary framework for lis, especially information retrieval (IR), in a way that goes beyond the cognitivist ‘information processing paradigm’. The main problem of this paradigm is that its concept of information and language does not deal in a systematic way with how social and cultural dynamics set the contexts that determine the meaning of those signs and words that are the basic tools for the organisation and retrieving of documents in LIS. The paradigm does not distinguish clearly enough between how the computer manipulates signs and how librarians work with meaning in practice when they design and run document mediating systems. The ‘cognitive viewpoint’ of Ingwersen and Belkin makes clear that information is not objective, but rather only potential, until it is interpreted by an individual mind with its own internal mental world view and purposes. It facilitates further study of the social pragmatic conditions for the interpretation of concepts. This approach is not yet fully developed. The domain analytic paradigm of Hjørland and Albrechtsen is a conceptual realisation of an important aspect of this area. In the present paper we make a further development of a non‐reductionistic and interdisciplinary view of information and human social communication by texts in the light of second‐order cybernetics, where information is seen as ‘a difference which makes a difference’ for a living autopoietic (self‐organised, self‐creating) system. Other key ideas are from the semiotics of Peirce and also Warner. This is the understanding of signs as a triadic relation between an object, a representation and an interpretant. Information is the interpretation of signs by living, feeling, self‐organising, biological, psychological and social systems. Signification is created and con‐trolled in a cybernetic way within social systems and is communicated through what Luhmann calls generalised media, such as science and art. The modern socio‐linguistic concept ‘discourse communities’ and Wittgenstein's ‘language game’ concept give a further pragmatic description of the self‐organising system's dynamic that determines the meaning of words in a social context. As Blair and Liebenau and Backhouse point out in their work it is these semantic fields of signification that are the true pragmatic tools of knowledge organ‐isation and document retrieval. Methodologically they are the first systems to be analysed when designing document mediating systems as they set the context for the meaning of concepts. Several practical and analytical methods from linguistics and the sociology of knowledge can be used in combination with standard methodology to reveal the significant language games behind document mediation.

The Disabled Living Foundation (DLF) is a national charity providing information on daily living equipment for disabled people. In 1984 a computerisation project began. One problem addressed has been the subject retrieval of information. This has involved the assessment of classification and thesaurus schemes. The DLF has developed a thesaurus to satisfy local needs and language, while remaining aware of existing classifications and thesauri in the same or proximate subject fields. Such schemes include for example, the Nordic Classification of Technical Aids for Disabled People, BSI ROOT Thesaurus, DHSS DATA thesaurus. The DLF thesaurus has been developed under considerable pressure but has attempted to respond to theory in the field as well as practical requirements. It is the result of both librarianship skills and the detailed occupational therapy and physiotherapy subject knowledge of the DLF information officers. This article sets the DLF thesaurus in context.