Expert Systems (ES) are as yet imperfectly defined. Their two consistently cited characteristics are domain knowledge and expert-level performance. We propose that current structural definitions are inadequate and suggest a view of ES as communication channels. We proceed to explore the factors influencing applicability of ES technology to an enterprise and the impacts that could be expected. A consequence of this view is the idea of incremental information loss on the path from the expert to the ES user. Strategies for (...) minimizing this loss derive naturally from our perspective and are evident in successful ES. (shrink)

All organisations must be able to answer questions from their respective constituencies. It is not an exaggeration to say that, in this respect, it is a challenge to handle the extremely broad action platform of local government administrations (municipalities). The present paper is a walk-through of questions from the citizens that are managed at Botkyrka municipality, Sweden. It is focussed on the use of an ‘intelligent’ citizen assistant.

Design can be thought of as a model for such endeavours as are intended to result in industrially manufactured products by means of thinking and other intellectual activity. Familiarity with the thinking involved in the designing process is important, not only for those engaged in training designers, but for anyone desirous of systemizing the endeavour. One procedure for approaching an understanding of the way designers think is to describe it with the help of different metaphors. There are some metaphors for (...) thinking about complicated and interrelated phenomena that should lend themselves to illustrating the thinking involved in design, albeit with reservations — e.g. the difficulty of allowing due consideration for what is unthinkable and indescribable in this context. (shrink)

The epistemological soundness of controlled clinical trials is questioned. It is argued that the real effect of therapies cannot be determined by such experiments because there is a significant interaction between the placebo effect and real effect created by the individual therapist and treatment situation which, however, is neglected in controlled clinical trials. This critical standpoint is supported by several pharmacological examples.

The epistemological soundness of controlled clinical trials is questioned. It is argued that the real effect of therapies cannot be determined by such experiments because there is a significant interaction between the placebo effect and real effect created by the individual therapist and treatment situation which, however, is neglected in controlled clinical trials. This critical standpoint is supported by several pharmacological examples.

This paper deals with various aspects of the development of data systems for engineering materials. The problem considered here is the difference between the end-users' mental model of materials, which focuses on performance, and the concepts of properties of materials held by materials specialists. Previous treatises on this problem have elaborated on systems aspects in general, emphasising incompatibilities in the relationship mentioned and the means of overcoming these incompatibilities by service management. Another perspective applied has been the historical one, combined (...) with experience of traditional views on science and technology. The present paper pursues this general path by discussing the problem in terms of visions, illusions and myths. These phenomena are thought to be both inevitable in this context and necessary in any attempt to understand the dilemma of data systems for engineering materials. It is believed that the views of the different parties involved are to a great extent steered by visions, illusions and myths, examples of which are discussed. Furthermore, it is suggested that these phenomena have roots in, or are expressions of, paradigms and values related to world pictures. Admittedly eclectic, this discussion leads to the conclusion that a solution to the dilemma in question cannot be found within computer science, materials technology and design theory only. Guidance has to be sought in philosophy and theory of science as well as in literature and the arts. In order to make it possible to implement ideas arrived at by such means, practitioners of psychology will probably have to be consulted. (shrink)

During the last two decades considerable efforts have been made to develop computerized data systems for engineering materials. The results have not come up to the expectations of systems that can be used by designers for selecting of materials. Some factors have been recognized as responsible for the slow progress. It has proved difficult, however, for those involved in this development to make use of such information about the systems in question. Conflicts have occurred between different parties involved. It now (...) seems that too little attention has been paid to the historical background of knowledge and systems related to civiliziation and society. A recently published review of world history from the point of view of the emergence of information technology has provided a basis for some considerations about the nature and roles of data systems. It can be shown that certain activities or features characterize each period of civilization and the development of computers and computerization should be considered as part of this sequence. The same is true for the world history of thinking and knowledge. In the present paper these historical considerations are combined with the observation that in their thinking and perception of ideas people appear to carry with them traditions from the past in varying degrees. Hence differences of opinion about the nature and roles of materials data systems may be explained by differences in the imprint of historical developments on people's ideas. In order to apply this lesson to the development of materials data systems, one has to learn also from the varying interpretations of world history that have been written through the ages. The best approach will probably be incremental and pragmatic rather than holistic and synoptic. (shrink)

This is the first book in welfare economics to be primarily intended for undergraduates and non-specialists. Concepts such as Pareto optimality in a market economy, the compensation criterion, and the social welfare function are explored in detail. Market failures are analysed by using different ways of measuring welfare changes. The book also examines public choice, and the issues of provision of public goods, median voter equilibrium, government failures, efficient and optimal taxation, and intergenerational equity. The three final chapters are devoted (...) to applied welfare economics: methods for revealing people's preferences, cost-benefit analysis, and project evaluation in a risky world. The book is intended for introductory and intermediate courses in welfare economics, microeconomics, and public economics. It will also be suitable for courses in health economics, environmental economics, and cost-benefit analysis, as well as those undertaking project evaluations in government agencies and private firms. (shrink)