Ever since MYCIN introduced the idea of computer-based explanations to the artificial intelligence community, it has come to be taken for granted that all knowledge-based systems (KBS) need to provide explanations. While this widely-held belief has led to much research on the generation and implementation of various kinds of explanations, there has however been no theoretical or empirical evidence to suggest that 1) explanations are used by users of KBS, and 2) the use of explanations benefits KBS users in some way. In view of this situation, this study investigates the use of explanations that are provided by a knowledge-based system, from the perspective of understanding both the specific factors that influence it, as well as its effects. The first part of this dissertation proposes a cognitive learning theory based model that both clarifies the reasons as to why KBS need to provide explanations and serves as the basis for conceptualizing the provision of KBS explanations. Using the concepts of the feed forward and feedback operators of cognitive learning it develops strategies for providing KBS explanations and uses them to classify the various types of explanations found in current KBS applications. The roles of feedforward and feedback explanations within the context of the theory of cognitive skill acquisition and a model of expert judgment are also analyzed. These, together with past studies of KBS explanations, suggest that user expertise, the types of explanations provided, and the level of user agreement are significant factors that influence the explanation seeking behavior of users. The dissertation also explores the effects of the use of KBS explanations in judgmental decision making situations supported by a KBS. It identifies and considers four distinct categories of potential effects of the use of explanations --- learning effects, perceived effects, behavioral effects, and effects on judgmental decision making. The second part of the dissertation empirically evaluates the explanation provision strategies in a laboratory experiment in which 80 novice and expert subjects used a KBS for financial analysis to make judgments under conditions of uncertainty. The experiment was designed specifically to investigate the following fundamental research questions: 1) To what extent are the various kinds of explanations used? 2)How does user expertise, the feedforward and feedback provision of explanations, and the level of user agreement influence the amount and the types of explanations that are used? and 3) Does the use of explanations affect the accuracy of judgmental decision-making and user perceptions of usefulness? Some of the major results relating to the determinants of the use of KBS explanations include:1) user expertise is not a determinant of the proportion of explanations used but influences the types of explanations that are used, 2) explanation provision strategy is a critical determinant of the use of KBS explanations with feedback explanations being used significantly more than feedforward explanations, and 3)the three types of explanations are used in different proportions with the Why and How explanations being used significantly more than the Strategic explanations. It was also found that the level of user agreement with the KBS had an "inverted-U" shaped relationship with the use of explanations. The least number of explanations are used when the level of user agreement is either very high or very low. The major results relating to the effects of the use of explanations include the following: 1) the increased use of feedback explanations improves the accuracy of judgmental decision-making but has no effect on user perceptions of usefulness, 2) the increased use of feedforward explanations while having no impact on the accuracy of judgments is positively correlated with user perceptions of usefulness, 3) the use of the Why explanation as feedback improves the accuracy of judgmental decision-making. As well, there was also evidence that the use of the KBS benefited both experts and novices. Considering that an understanding of the determinants and effects of the use of KBS explanations is a critical prerequisite for the design of KBS explanations, these and other findings of the study contribute both towards the development of a theoretical basis for the provision of KBS explanations, as well as the practical design of such explanation facilities. / Business, Sauder School of / Management Information Systems, Division of / Graduate

The thesis describes the EU/EC Twinning and TAIEX Instruments in the context of the management of these instruments by the Czech authorities and of the capacity for the Czech Republic to participate in these instruments as a 'service provider'. The main target is to provide the basic information about IPA/ENPI, Twinning and TAIEX, which should be further updated based on practical experience of the Czech experts involved in TW/TAIEX activities.

Bibliography: pages 227-236. / This thesis concentrates on several important issues in expert system research, namely - representation of knowledge - control of reasoning - implementation of non-monotonic logics via truth maintenance systems. There are three parts to this thesis. PART1 covers the background research in the above mentioned topics. PART2 discusses the WISE system and the way in which research from PART1 was applied to the development of the WISE shell. PART3 considers the features of other expert system shells.

Interactive as well as Automatic Verification and Validation is valuable, especially when the size of a knowledge base grows and manual techniques are not feasible. It ensures the stability of the system and raises the confidence in its level of performance. In this dissertation I address the problem of verification and validation of rule based expert systems. It is a problem knowledge engineers have to deal with while building their expert systems to ensure the reliability, accuracy, and completeness of their knowledge bases. The objective of this research is to make it easy for expert systems developers to build the right system by proposing practical and simple methods for building verification and validation programs to insure the integrity and performance of large scale knowledge based systems.

The thesis called "Expert proofs" deals with one of the types of proper evidence which is applied in cases when an expert report is necessary to clarify facts important for criminal trial proceedings. Thesis is divided into 5 basic chapters. The first chapter is introductory and talks about some of the general problems of expert laws - evaluation of the current legal regulations of expert's function - expert law and expert ordinance, especially from the point of view of the changes that these legal regulations have undergone as well as the forthcoming changes in the form of updating of the current law and preparation of a brand new law. It also talks about definition of an expert, especially the difference between a witness and a consultant, then briefly about their rights and duties in the criminal trial proceedings in general. The second chapter deals with the presence of an expert explicitly in criminal trial proceedings and is divided into three parts. The first one provides basic information about admitting an expert and its form. The second one concerns the definition of an expert's assignment and the third one concerns preparation of an expert report, in which the expert familiarizes themselves with the criminal case. The third chapter deals with the actual output of an expert's investigation, its...

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The modern auditor is, because of an increased complexity, dependent on the use of experts. Simultaneously different scandals have occurred where the auditor in fact have been using experts. Although the auditor is using an expert, the auditor alone is responsible for the statement that the expert makes. Research simultaneously indicates that the auditor’s use of experts is a difficult task. Because of the scandals that have occurred and that research in this specific area is limited it would be interesting to investigate the affects on comfort. The purpose of this paper is to investigate how the auditor’s use of experts affects comfort. To fulfill this purpose, this paper builds on a deductive approach. A model have been developed based on previous research containing various factors such as; Risk, “structure/judgment”, “trust”, information asymmetry and auditor overconfidence. This model has been empirically tested through the use of interviews with auditors and experts. The results from this study indicate that the use of experts have a positive affect on the auditors perceived comfort. The conclusions drawn indicate, among other things, that the customer perspective is a vital part in the auditor’s work and that this seems to have an affect on comfort. This study also is considered to demonstrate the importance of the concept trust for the creation of comfort. It has also appeared that the auditors’ control of the expert evaluation sometimes is inadequate. The contributions made by this paper is mainly that it illuminates an area that is relatively unexplored, as no earlier research seems to have investigated the use of experts from a comfort perspective. This paper also contributes in highlighting the problems with the auditor’s lack of controlling the expert, when the auditors mission is to bring comfort to the public / Den moderna revisorn är nuförtiden, på grund av en ökad komplexitet, beroende av användningen av experter. Olika skandaler har samtidigt inträffat där det visats sig att revisorn har använt sig av experter i revisionen. Trots att revisorn använder experter står denna ensamt ansvarig för det utlåtande som experten ger. Forskning ger samtidigt indikationer på att revisorns användande av experter innebär en svår situation. På grund av de skandaler som skett och att forskning inom området är begränsad gör det intressant att undersöka hur detta påverkar revisorns komfort. Syftet med denna studie är att undersöka hur revisorns användning av experter påverkar komforten. För att kunna uppfylla detta syfte har denna studie baserats på en deduktiv ansats. En modell har utvecklats baserad på tidigare forskning innehållande olika faktorer såsom; risk, structure/judgement, ”trust”, informationsasymmetri och revisorns övertro. Denna modell har sedan testats empiriskt genom intervjuer med revisorer och experter. Resultaten från denna studie indikerar att användningen av experter har en positiv effekt på revisorns komfort. Slutsatserna som dragits innefattar bland annat att indikationer på att kundperspektivet har en central del i revisorns arbete och att detta är något som tycks ha en påverkan på komforten. Denna studie anses även visa på betydelsen av begreppet ”trust” för skapandet av komfort. Det har även framkommit att revisorns kontroll av expertens bedömning ibland är bristande. Uppsatsens bidrag är framförallt att den belyser ett forskningsområde som är tämligen outforskat, då ingen tidigare forskning tycks ha undersökt användandet av experter ur komfortperspektivet. Uppsatsen bidrar även i form av att den belyser problematiken med att revisorn brister i kontrollen av experten trots att revisorns uppdrag är att skapa komfort hos allmänheten.

Thesis (M.S.)--Rochester Institute of Technology, 1991. / Typescript. Includes bibliographical references.

Thesis (M.S.)--Rochester Institute of Technology, 1992. / Typescript. Bibliography: leaves 240-248.